ozun
L (-)-Camphor Sulfonic Acid
fari ko kusan fari crystal foda
35963-20-3
Saukewa: C10H18O5S
250
252-817-9
| samuwa: | |
|---|---|
Bayanin Samfura
L (-)-Camphorsulfonic acid, wanda kuma aka sani da (1R)-(-) 10-camphorsulfonic acid ko L (-) -CSA, wani nau'in sulfonic acid ne mai aiki na gani tare da lambar CAS 35963-20-3.
Tsararren tsarin sa na kafur da aka samo shi da ƙungiyar sulfonic acid mai ƙarfi yana sa ya zama mai amfani azaman wakili na warwarewar chiral, reagent synthesis reagent, acid mai kara kuzari da matsakaicin sinadarai na musamman.
L (-) -CSA yana da mahimmanci musamman don warware amines na tsere. Yana iya mayar da martani tare da biyu enantiomers na asali fili don samar da diastereomeric salts tare da daban-daban crystallization ko solubility hali. Wannan bambance-bambance na iya ƙyale gishiri ɗaya ya rabu ta hanyar zaɓin crystallization.
AOZUN yana ba da ingantaccen L (-) -camphorsulfonic acid don bincike, haɓaka tsari da haɗin masana'antu. Dole ne a kafa dacewa da takamaiman magunguna ko ƙayyadaddun aikace-aikacen ta hanyar cancantar abokin ciniki.
Abu |
Bayani |
|---|---|
Sunan samfur |
L (-)-Camphorsulfonic acid |
Sunan sinadarai da aka fi so |
(1R)-(-)-10-Camphorsulfonic Acid |
Gajarta |
L (-) CSA |
Lambar CAS |
35963-20-3 |
lambar EC |
252-817-9 |
Tsarin kwayoyin halitta |
Saukewa: C10H16O4S |
Nauyin kwayoyin halitta |
232.30 g/mol |
Bayyanar |
Fari zuwa kashe-fari crystalline foda |
Matsayin sinadarai |
Chiral Organic sulfonic acid |
Ayyukan gani |
Levorotatory |
Na yau da kullun |
≥99.0% |
Solubility |
Mai narkewa cikin ruwa |
Babban aiki |
Chiral warwarewa wakili da kira reagent |
Lambar CAS, takamaiman jujjuyawar gani da nau'in sinadarai yakamata a bincika tare. Sunayen samfur kaɗai na iya zama mara dogaro saboda wasu shafukan masu kaya suna amfani da L/D, R/S marasa daidaituwa da ƙa'idodin juyawa mara kyau/mara kyau.
AOZUN yana goyan bayan masu siye waɗanda ke buƙatar daidaitaccen asalin sinadarai, jujjuyawar gani da kuma takaddun samar da masana'antu.
Abubuwan da muke samarwa sun haɗa da:
High-tsarki L (-) -CSA don haɗin masana'antu
Ƙayyadaddun lambar CAS da sigar enantiomeric
Sarrafa takamaiman jujjuyawar gani
Siffar kristal mai fari zuwa fari
Danshi da inorganic-tsaftataccen iko
Takamaiman Takaddun Takaddun Takaddun Takaddun Bincike
SDS da goyon bayan fasaha-takardun
Samfuran adadi don cancantar dakin gwaje-gwaje
Zaɓuɓɓukan marufi na masana'antu
Tallafin jigilar kayayyaki na duniya
Taimako yana bambanta L(-), D (+) da siffofin DL
Lokacin neman zance, samar da aikace-aikacen da aka yi niyya, ƙayyadaddun ƙayyadaddun da ake buƙata, adadin oda, makoma da kowane iyaka na musamman na ruwa, ƙarfe, sulfate ko sauran kaushi.
Tebur mai zuwa yana wakiltar ƙayyadaddun kasuwanci na yau da kullun. Ƙayyadaddun tallace-tallace na AOZUN da aka amince da shi da takaddun shaida na nazari dole ne su mallaki kowace ma'amala.
Gwaji abu |
Musamman takamaiman |
Bayyanar |
Fari zuwa kashe-fari crystalline foda |
Assay |
≥99.0% |
Takamaiman jujjuyawar gani [α] D20 |
-21.0° zuwa -23.0° |
Asarar bushewa |
≤1.0% |
Ruwa |
≤0.8% |
Kewayon narkewa |
Kimanin 193-202 ° C, tare da yiwuwar bazuwa |
Iron |
≤20 ppm |
Sulfate |
≤0.20% |
Ragowa akan kunnawa |
Ƙimar abokin ciniki-yarjejeniya |
Ragowar kaushi |
Ƙimar abokin ciniki-yarjejeniya |
Takamaiman jujjuyawar gani yana da ma'ana kawai lokacin da aka ayyana zafin gwajin, tsayin raƙuman ruwa, ƙarfi da taro. Ya kamata a bayyana waɗannan sharuɗɗan akan ƙayyadaddun bayanai ko COA.
Sakamakon tantancewar da aka samu ta HPLC, titration-base titration ko wata hanya bai kamata a kula da ita ta atomatik azaman daidai ba. Masu saye yakamata su tabbatar da hanyar nazari yayin kwatanta masu kaya.
Mafi sanannun aikace-aikacen L (-) -CSA shine ƙudurin amines na tseren tsere da sauran mahadi na asali.
Lokacin da acid enantiopure ya amsa tare da tushen tsere, zai iya samar da gishiri diastereomeric guda biyu. Ba kamar enantiomers ba, waɗannan gishiri na iya samun nau'ikan kaddarorin jiki daban-daban, gami da:
Solubility
Ƙimar crystallization
Crystal form
Halin narkewa
Ayyukan tacewa
Ana iya amfani da waɗannan bambance-bambance a wasu lokuta don ware gishiri ɗaya zaɓi. Ana iya sakin tushen da aka warware daga baya daga keɓe gishiri ta amfani da tsari mai dacewa na ƙasa.
Ayyukan ƙudirin ƙayyadaddun substrate. L (-) -CSA ba za ta samar da ingantacciyar rabuwa ga kowane amine tseren tsere ba, don haka sauran ƙarfi da nunawa crystallization wajibi ne.
L(-)-CSA ana amfani da shi a cikin zaɓaɓɓun hanyoyin magunguna kamar:
Wakilin warwarewar chiral
Acid mai yin gishiri
An Organic kira reagent
Matsakaicin tsari
A stereochemical iko reagent
Ƙarfin kwayoyin acid mai haɓakawa
Ana iya amfani da shi don samar da gishiri na camphorsulfonate, wanda ake kira camsilate ko camsylate salts.
Amfani da masana'antu L(-)-CSA a cikin tsarin magunguna baya sanya kayan ya zama API, kayan haɓakawa ko samfur na harhada magunguna. Dole ne mai siye ya kafa ma'aunin ingancin da ake buƙata, sarrafa ƙazanta, ganowa da takaddun tsari.
L (-)-Camphorsulfonic acid na iya amsawa tare da mahaɗan abubuwan da suka dace don samar da salts na camphorsulfonate.
Samuwar gishiri na iya canza kaddarorin kamar:
Crystallinity
Hygroscopicity
Halin thermal
Solubility
Tsabar sinadarai
Halayen tacewa
Halin kulawa
Ba za a iya hasashen waɗannan tasirin daga acid ɗin kaɗai ba. Ya kamata a kammala gwajin gwajin gishiri, ƙayyadaddun nau'i mai ƙarfi da gwajin kwanciyar hankali don kowane fili mai niyya.
A matsayin mai ƙarfi na sulfonic acid, L(-)-CSA na iya ƙididdige shi azaman mai haɓaka acid ko reagent na acidic a cikin zaɓaɓɓun canjin kwayoyin halitta.
Yiwuwar amfani sun haɗa da:
Acid-catalyzed kira
Matakan kariya da kariya
Halayen sake tsarawa
Halin natsuwa
Shiri na tsaka-tsakin chiral
Abubuwan da aka samo asali na camphorsulfonate
Dacewar amsawa ya dogara da abin da ake buƙata, sauran ƙarfi, zazzabi da sauran reagents. Ana buƙatar kimantawar dakin gwaje-gwaje kafin haɓakawa.
L (-)-CSA ana iya amfani dashi azaman:
A chiral counterion
A derivatization reagent
A chiral gane reagent
Bangaren ion-pairing
Abun tunani don haɓaka hanya
Reagent a cikin binciken stereochemical
Aikace-aikacen nazari na iya buƙatar ƙuƙƙun iyakoki don tantancewa, tsaftar gani, ruwa da ƙazanta fiye da daidaitattun aikace-aikacen haɗin masana'antu.
Camphorsulfonic acid kuma ana bincikar su azaman dopants na acidic wajen gudanar da polymers kamar polyaniline.
Tsarin chiral na iya taimakawa gabatar da yanayin chiral cikin zaɓaɓɓun kayan aiki. Wannan ƙwararren bincike ne da aikace-aikacen kayan aiki, kuma aikin ya dogara da tsarin polymer, yanayin doping da hanyar sarrafawa.
Ƙudurin Chiral ta hanyar samuwar gishiri gabaɗaya ya ƙunshi ƙa'idodi huɗu.
L (-)-CSA tana ba da gudummawar proton zuwa amintaccen amintaccen. Sakamakon ammonium camphorsulfonate shine gishiri ionic.
Masu haɓakawa guda biyu na amine tseren suna samar da gishiri diastereomeric daban-daban guda biyu tare da eantiomer guda ɗaya na L(-)-CSA.
Idan gishirin guda biyu suna da isasshe daban-daban solubility ko halayen crystallization, mutum na iya yin kyalkyali da kyau daga tsarin da aka zaɓa.
Za a iya bi da gishirin da aka keɓe ta amfani da tsari mai dacewa don saki tushen wadataccen kyauta. Dole ne a auna rabon eantiomeric, yawan amfanin ƙasa da tsaftar sinadarai.
Ƙaddamar da nasara ya dogara fiye da ainihin wakilin warwarewa. Mahimman canji sun haɗa da:
Abubuwan da ke narkewa
Abun ciki na ruwa
Acid-to-base molar rabo
Hankali
Jerin kari
Bayanin yanayin zafi
Yawan sanyi
Hadawa
Shuka tsaba
Lokacin crystallization
Yanayin wanka
Ya kamata ingantawa ya dogara ne akan gwajin gwaji maimakon girke-girke na duniya.
Samfura |
Bayanin sinadarai gama gari |
Lambar CAS |
Halin gani |
Amfani na yau da kullun |
L (-)-Camphorsulfonic acid |
(1R)-(-)-10-camphorsulfonic acid |
35963-20-3 |
Juyawa mara kyau |
Ƙaddamarwar Chiral, kira na chiral da samuwar gishiri |
D (+) - Camphorsulfonic acid |
(1S)-(+)-10-camphorsulfonic acid |
3144-16-9 |
Juyawa mai kyau |
Ƙaddamar da ke buƙatar kishiyar enantiomer |
DL-Camphorsulfonic acid |
Racemic camphorsulfonic acid |
5872-08-2 |
Babu jujjuyawar mahaɗar gani a cikin kyakkyawan abokin tsere |
Amfani da acid gabaɗaya da aikace-aikacen da ba na chiral ba |
L (-)-CSA da D (+) -CSA sune masu haɓakawa. Suna da kaddarorin jiki iri ɗaya da yawa waɗanda ba na chiral ba amma suna mu'amala daban-daban tare da kayan aikin chiral.
DL-camphorsulfonic acid ya ƙunshi duka enantiomers kuma yawanci ba zai iya samar da aikin warwarewa iri ɗaya azaman darajar enantiopure ba.
Bai kamata a musanya nau'ikan nau'ikan daban-daban ba tare da kimanta tsari ba.
Don kayan kasuwancin da aka gano ta CAS 35963-20-3, L (-) -camphorsulfonic acid yawanci ana gano su azaman (1R) - - 10-camphorsulfonic acid.
Duk da haka, haruffa L da D ba su kafa cikakkiyar tsarin R/S ga duk sunadarai ba. Alamun ƙari da ragi suna nuna jagorar jujjuyawar gani da aka yi gwajin gwaji kuma ba sa ayyana cikakken tsari da kansa.
Don ingantaccen siyayya, saka:
Cikakken sunan sinadarai
Lambar CAS
Juyawa na gani da ake buƙata
Yanayin gwajin juyawa
Assay
Siffar sinadarai
Takardun tallafi da ake buƙata
A'a. Takamaiman jujjuyawar gani shine mahimmancin ainihi da gwajin daidaito, amma ba koyaushe ba shine cikakken ma'aunin tsarkin eantiomeric.
Ƙimar da aka auna na iya shafar:
Hankali
Mai narkewa
Zazzabi
Tsawon tsayi
Abun ciki na ruwa
Najasa sinadarai
Daidaita kayan aiki
Hanyar gwaji
Idan tsaftar sitiriyo sitiriyo yana da mahimmanci, mai siye ya kamata yayi la'akari da hanyar nazarin chiral da ta dace ban da takamaiman juyawa.
Hanyoyi masu yuwuwa sun haɗa da chiral HPLC, chiral GC ko wata ingantacciyar hanyar sitiriyo sitiriyo wacce ta dace da kayan.
Tabbatar cewa samfurin da ake buƙata shine CAS 35963-20-3. Kada ka yi oda kawai ta hanyar kafursulfonic acid ko CSA saboda waɗannan sunaye na iya komawa ga siffofin D(+) ko DL.
Sakamakon juyawa biyu yakamata a kwatanta shi kawai lokacin da maida hankali, ƙarfi, zafin jiki da tsayin raƙuman ruwa iri ɗaya ne.
Ƙimar kamar -21° ba tare da ƙayyadadden yanayin gwaji bai cika ba don cancantar mai kaya.
Tambayi ko an auna gwajin ta:
HPLC
Neutralization titration
Dry-tushen lissafi
Wata ingantacciyar hanyar
Sakamakon titration yana auna abun ciki na acid amma maiyuwa bazai samar da ƙazanta iri ɗaya kamar tantancewar chromatographic ba.
Ruwa na iya rinjayar lissafin abun ciki mai aiki, stoichiometry na gishiri, rushewa da halayen crystallization.
Asarar bushewa da ruwan Karl Fischer gwaje-gwaje daban-daban ne kuma yana iya haifar da sakamako daban-daban. Tabbatar da wanda ke sarrafa tsari.
Race karafa da ragowar inorganic na iya yin tasiri:
Launin samfur
Halin amsawa
Tsarkakewa ta ƙasa
Matsakaicin matakai masu kara kuzari
Bayanan ƙazanta na magunguna
Abokan ciniki tare da matakai masu mahimmanci yakamata su samar da takamaiman ƙayyadaddun ƙayyadaddun aikace-aikacen.
Bayanin gabaɗaya kamar ' ragowar kaushi sun cika' bai isasshe ƙayyadaddun tsari ba.
Ya kamata mai siye ya ayyana:
Wadanne abubuwan kaushi dole ne a gwada
Iyakokin da suka dace
Hanyar nazari
Ko kowane tsari yana buƙatar gwaji
Tsarin kwayoyin halitta C10H16O4S da nauyin kwayoyin halitta 232.30 sun kwatanta L(-) CSA.
Idan mai sayarwa ya jera C10H18O5S ko nauyin kwayoyin halitta kusa da 250.31, ana iya gabatar da samfurin azaman monohydrate ko bayanan samfurin na iya zama sabani. Tabbatar da ainihin nau'in sinadarai, ƙayyadaddun ruwa da tushen tantancewa kafin yin oda.
Kwatanta ƙayyadaddun bayanai, samfurin COA, SDS, bayanan masana'antu da hanyoyin nazari.
Tabbatar da lambar CAS, bayyanar, tantancewa da gwajin da ya dace kamar IR ko wata ingantacciyar hanya.
Auna takamaiman jujjuyawar ƙarƙashin yanayi iri ɗaya da aka bayyana a cikin ƙayyadaddun siyan.
Yi amfani da madaidaiciyar hanyar chiral lokacin da tsarkin enantiomeric shine sifa mai mahimmancin tsari.
Gwada abu a cikin tsari mai ƙarfi mai ƙarfi a daidaitaccen taro da zafin jiki da ake buƙata.
Yi rikodin:
Lokacin rushewa
Bayyanar bayani
Launi
Ba a warware ba
Tasirin yanayin zafi
Hazo yayin sanyaya
Don aiwatar da ƙudurin chiral, kimanta samuwar gishiri da ƙirƙira ta amfani da ƙananan gwaje-gwaje.
Auna:
keɓe yawan amfanin ƙasa
Tsaftar sinadarai
Enantiomeric rabo
Gishiri stoichiometry
Crystal form
Yawan tacewa
Asarar uwar-giya
Maimaituwa
Inda aikace-aikacen ke da mahimmanci, cancanta fiye da nau'in samarwa kafin amincewar kasuwanci.
Yi bitar samar da zafi, haɗawa, ƙarin jerin abubuwa, crystallization, tacewa da abun ciki kafin ƙara girman tsari.
L (-)-Camphorsulfonic acid yana narkewa a cikin ruwa kuma yana dacewa da zaɓaɓɓun abubuwan kaushi na ƙwayoyin cuta na polar.
Ainihin narkewa ya dogara da:
Asalin mai narkewa
Abun ciki na ruwa
Zazzabi
Hankali
Sauran narkar da mahadi
Ko acid kyauta ko gishiri yana nan
Don matakan ƙuduri, matsakaicin solubility ba koyaushe ake so ba. Rabuwa mai inganci yakan dogara ne akan samun bambanci mai narkewa mai amfani tsakanin gishiri diastereomeric guda biyu.
Don haka zaɓin mai narkewa yakamata yayi la'akari da samuwar gishiri da zaɓin crystallization.
Marukunin masana'antu na yau da kullun na iya haɗawa da:
Jakunkuna da aka rufe tare da layin kariya
Fiber ganguna tare da layukan ciki
25 kg ganguna masana'antu, batun tabbatarwa
Marufi da abokin ciniki ya yarda don ƙwararrun umarni
Marufi na ƙarshe ya dogara da girman tsari, wuri, buƙatun sufuri da ƙayyadaddun abokin ciniki.
Ya kamata a sake rufe kwantenan da aka yi amfani da su da sauri don hana sha da gurɓata ruwa.
Store L (-) -camphorsulfonic acid:
A cikin marufi na asali tam rufe
A cikin sanyi, bushe da wuri mai cike da iska
Nisantar danshi da hasken rana kai tsaye
Nisantar sansanoni marasa jituwa da kayan amsawa
A cikin marufi mai juriya ko lalata
A ƙarƙashin sharuɗɗan da aka bayyana a cikin AOZUN SDS na yanzu
Ka guji ɗaukar dogon lokaci zuwa iska mai ɗanɗano. Kar a mayar da abin da ba a yi amfani da shi ba ko gurbataccen abu zuwa ainihin akwati.
Rayuwar tsararru yakamata ta dogara da alamar samfur, ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun bayanai da yanayin ajiya maimakon bayanan gidan yanar gizon gabaɗaya.
L (-) -camphorsulfonic acid abu ne mai lalata acidic kuma yana iya haifar da ƙonewar fata mai tsanani da mummunar lalacewar ido.
Abubuwan sarrafawa da aka ba da shawarar sun haɗa da:
Safofin hannu masu jurewa da sinadarai
Tufafin kariya
Gilashin tsaro
Kariyar fuska inda za'a iya fantsama ko fallasa kura
Dace iskar gida
Matakan sarrafa ƙura
Wuraren wankin gaggawa mai isa
Ma'aikatan da aka horar da su yadda ya kamata
Guji ƙurar numfashi kuma hana haɗuwa kai tsaye da fata da idanu.
Rarraba sufuri na iya dogara da nau'in samfur, marufi, iko da SDS mai siyarwa na yanzu. Yi amfani da sabon AOZUN SDS koyaushe da takaddun jigilar kaya lokacin shirya sufuri.
Wannan shafin samfurin ba musanyawa bane ga Tabbataccen Bayanan Tsaro.
Ya kamata a tabbatar da takaddun da ke akwai lokacin neman zance. Dangane da tsari da inda aka nufa, takaddun na iya haɗawa da:
Takamaiman Takaddun Takaddun Takaddun Takaddun Bincike
Takardar bayanan Tsaro
Takardar bayanan Fasaha
Daftar kasuwanci
Jerin kaya
Takardar asalin ƙasar
Takardun sufuri
Bayanin masana'anta
Bayanin saura-mai narkewa
Allergen ko bayanin asalin dabba idan an zartar
Bayanin tsari da ake buƙata don kasuwar makoma
Ya kamata a amince da takamaiman takaddun aikace-aikacen kafin a ba da odar siyan.
Don samun ingantaccen zance, samar da:
Sunan samfur da lambar CAS
Binciken da ake buƙata
Da ake buƙata takamaiman juyi da yanayin gwaji
Iyakar ruwa ko asara-kan bushewa
Iyaka na ƙarfe, sulfate ko saura akan kunnawa
Abubuwan da suka saura-kamuwa
Adadin da ake buƙata
Yawan amfanin shekara-shekara
Aikace-aikacen da aka yi niyya
Bukatun marufi
tashar tashar jirgin ruwa ko adireshin isarwa
Incoterm da ake buƙata
Da ake buƙata inganci da takaddun jigilar kaya
Samfur da ake bukata
Lambar CAS na L (-)camphorsulfonic acid, wanda aka fi sani da (1R)-(-) 10-camphorsulfonic acid, shine 35963-20-3.
Tsarin kwayoyin halitta na anhydrous L (-) -camphorsulfonic acid shine C10H16O4S, kuma nauyin kwayoyinsa shine kusan 232.30 g/mol.
Babban amfaninsa na masana'antu shine azaman wakili na warwarewar chiral don amines na tsere da sauran mahalli na asali. Hakanan ana amfani dashi a cikin samuwar gishiri, tsarin sinadarai na magunguna, haɗaɗɗun kwayoyin halitta da bincike na kayan musamman.
Yana amsawa tare da tushen tsere don samar da gishiri diastereomeric guda biyu. Idan gishiri yana da nau'in solubility ko halayen crystallization, ana iya ware mutum da zaɓi.
A'a. Suna gaba da enantiomers tare da lambobi daban-daban na CAS kuma sabanin jujjuyawar gani. L (-)-CSA tana da lambar CAS 35963-20-3, yayin da D (+) -CSA yawanci tana da lambar CAS 3144-16-9.
Ba a cikin tsarin ƙuduri na chiral ba. DL-camphorsulfonic acid jinsi ne kuma yawanci ba zai iya samar da wariya iri ɗaya na sitiriyo sitiriyo azaman wakili mai warwarewa ba.
Kewayon kasuwanci gama gari shine kusan -21.0° zuwa -23.0°. Dole ne a bayyana ma'anar ƙarfi, maida hankali, zafin jiki da tsawon tsayi kafin a kwatanta sakamako.
Ba da kanta ba. Yana da amfani don ainihi da daidaiton tsari, amma ana iya buƙatar ingantacciyar hanyar nazarin chiral lokacin da tsabtar enantiomeric ke da mahimmanci.
Ee. Yana narkewa cikin ruwa. Solubility a cikin ainihin tsari zai dogara ne akan maida hankali, zafin jiki, sauran abubuwan da aka gyara da ko gishiri ya samo asali.
Ana iya ba da L(-)-CSA don haɗakar magunguna da aikace-aikacen tsaka-tsaki, amma kalmar darajar magani yakamata a yi amfani da ita kawai lokacin da ƙayyadadden ma'aunin inganci, tsarin masana'anta da takaddun tallafi.
Bai kamata a siffanta shi ta atomatik azaman API ko kayan aikin magunguna ba.
Maɓallin maɓalli sune tantancewa, takamaiman juyawa na gani, ruwa ko asara akan bushewa, ainihin sinadari, bayyanar, halin narkewa da ƙazantattun aikace-aikace.
Ajiye shi sosai a cikin wuri mai sanyi, busasshe kuma mai cike da iska. Kare shi daga danshi, hasken rana, gurɓatawa da abubuwan da ba su dace ba. Bi samfurin SDS na yanzu.
Samfurin samuwa za a iya tabbatar da daidai da sa, manufa da kuma adadin da ake bukata. Haɗa aikace-aikacen da aka nufa da ƙayyadaddun bayanai lokacin neman samfurin.
AOZUN yana ba da L (-) -camphorsulfonic acid, CAS 35963-20-3, don ƙudurin chiral, tsaka-tsakin magunguna, ƙirar ƙwayoyin cuta da aikace-aikacen sinadarai na musamman.
Tuntuɓi AOZUN tare da ƙayyadaddun ƙayyadaddun da ake buƙata, yawa, aikace-aikacen, marufi da wurin isarwa. Ƙungiyarmu za ta tabbatar da samfurin da ake samuwa, takardun tsari, samuwan samfurin da sharuɗɗan kasuwanci.