Racemic Structures and Optical Resolution by Preferential Crystallization of Organic Ammonium Salts of (±)-Mandelic Acid
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چکیده
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control of the optical properties of nanoparticles by laser fields
در این پایان نامه، درهمتنیدگی بین یک سیستم نقطه کوانتومی دوگانه(مولکول نقطه کوانتومی) و میدان مورد مطالعه قرار گرفته است. از آنتروپی ون نیومن به عنوان ابزاری برای بررسی درهمتنیدگی بین اتم و میدان استفاده شده و تاثیر پارامترهای مختلف، نظیر تونل زنی(که توسط تغییر ولتاژ ایجاد می شود)، شدت میدان و نسبت دو گسیل خودبخودی بر رفتار درجه درهمتنیدگی سیستم بررسی شده اشت.با تغییر هر یک از این پارامترها، در...
15 صفحه اولOptical Resolution by Preferential Crystallization of (RS)-2-Amino-3-(2-carboxyethylthio)propanoic Acid.
Electrophilic additions of DL- and L-Cys to propenoic acid afforded (RS)- and (R)-2-amino-3-(2-carboxyethylthio)propanoic acids [(RS)- and (R)-ACE], respectively. (RS)-ACE was found to exist as a conglomerate based on its melting point, solubility, and infrared spectrum. (RS)-ACE was optically resolved by preferential crystallization to yield (R)- and (S)-ACE. The obtained (R)- and (S)-ACE were...
متن کاملOrganic ammonium salts. VII.* Preparation and infrared spectra of some ammonium derivatives of 11-aminoundecanoic acid
When studying some organic ammonium salts as potential solubilizers [1—4] we found that they possessed good surface-active properties as well as significant antimicrobial activity. The assumption of favourable relationship between the effect of the ammonium group and the properties of the alkanecarboxylic acid and of its esters, respectively, prompted us to prepare the title compounds and study...
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Um método empregando “bulk liquid membrane” (BLM) e o complexo ácido di(2-etilhexil) fosfórico (D2EHPA) e ácido O,O’-dibenzoil-(2R, 3R)-tartárico (L-(-)-DBTA) foi desenvolvido para a separação por extração do ácido mandélico racêmico (rac MA). Os efeitos de tempo de resolução, concentração de D2EHPA na fase orgânica, concentração de rac MA na fase doadora, velocidade de agitação e temperatura s...
متن کاملAre the Crystal Structures of Enantiopure and Racemic Mandelic Acids Determined by Kinetics or Thermodynamics?
Mandelic acids are prototypic chiral molecules where the sensitivity of crystallized forms (enantiopure/racemic compound/polymorphs) to both conditions and substituents provides a new insight into the factors that may allow chiral separation by crystallization. The determination of a significant number of single crystal structures allows the analysis of 13 enantiopure and 30 racemic crystal str...
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ژورنال
عنوان ژورنال: Bulletin of the Chemical Society of Japan
سال: 1986
ISSN: 0009-2673,1348-0634
DOI: 10.1246/bcsj.59.2669