Optical Resolution of Alcohols as Carbamates by HPLC on Cellulose Tris(phenylcarbamate) Derivatives

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...

Derivatives Containing Carbamates and Carbamides: as Selective Calcium Channel Blockers

The curtius rearrangement of Ethyl 1 (2 – azido – 2 oxoethyl) – 6 – methyl – 2 – oxo – 4 – (3 – substituted) 1, 2, 3, 4 – tetrahydropyrimidine -5 – carboxylate prepared from the readily accessible 4 (1 – substituted) – 5 ethoxy carbonyl – 6 methyl] 3, 4 – dihydropyrimidine – 2 (1H) – one was investigated in presence of ethanol, substituted phenols and substituted amines. The resulting carbamate...

Theoretical prediction of selectivity in kinetic resolution of secondary alcohols catalyzed by chiral DMAP derivatives.

The mechanism of esterification of the secondary alcohol 1-(1-naphthyl)ethanol 9 by isobutyric anhydride catalyzed by 4-pyrrolidinopyridine (PPY, 11) and a series of single enantiomer atropisomeric 4-dialkylaminopyridines 8a-g has been studied computationally at the B3LYP/6-311+G(d,p)//B3LYP/6-31G(d) level. Comparison of the levels of enantioselectivity predicted computationally with the result...

Hydrolytic Hydrogenation of Cellulose to Sugar Alcohols by Nickel Salts

Development and Evaluation of Thymol Microparticles Using Cellulose Derivatives as Controlled Release Dosage Form

Thymol, an important and advantageous component of many essential oils, has been applied as an antimicrobial agent in animals. To increase the duration of action of this compound in ruminants, it was decided here to prepare a controlled release carrier for thymol. Hydroxy propyl methyl cellulose (HPMC) and ethyl cellulose (EC) were used as the matrix polymer here. Mixtures of thymol with eight ...