Synthesis and Characterization of Polycarbonates by Melt Phase Interchange Reactions of Alkylene and Arylene Diacetates with Alkylene and Arylene Diphenyl Dicarbonates
作者:Bassam A. Sweileh、Yusuf M. Al-Hiari、Mohammad H. Kailani、Hani A. Mohammad
DOI:10.3390/molecules15053661
日期:——
successful synthesis of a series of aromatic-aromatic and aromatic-aliphatic polycarbonates having inherent viscosities from 0.19 to 0.43 dL/g. Thus low to intermediate molecular mass polymers were obtained. The (13)C-NMR spectra of the carbon of the carbonate group showed that the formed polycarbonates contain partial random sequence distribution of monomer residues in their chains. The polycarbonates
[EN] SYNTHESIS OF BICYCLO[2.2.2]OCTANE DERIVATIVES<br/>[FR] SYNTHÈSE DE DÉRIVÉS DE BICYCLO[2.2.2]OCTANE
申请人:EASTMAN CHEM CO
公开号:WO2019075004A1
公开(公告)日:2019-04-18
Provided is a process for the preparation of certain 1,4-bicyclo[2.2.2]octane derivatives. The new synthetic procedure involves treating 1,4-dimethylene cyclohexane with an oxidizing agent in the presence of a transition metal catalyst to afford an oxo-substituted bicyclo[2.2.2]octane species. This intermediate structure can then be further derivatized. The processes of this disclosure thus affords a novel and simplified means for the commercial production of a wide variety of bicyclo[2.2.2]octane derivatives.
[EN] SYNTHESIS OF BICYCLO(2.2.2)OCTANES<br/>[FR] SYNTHÈSE DE BICYCLO (2.2.2) OCTANES
申请人:EASTMAN CHEM CO
公开号:WO2018075301A1
公开(公告)日:2018-04-26
Provided is a process for the preparation of certain 1,4- bicyclo[2.2.2]octane derivatives. The new synthetic procedure involves treating 1,4-dimethylene cyclohexane with an oxidizing agent in the presence of a transition metal catalyst comprising a palladium compound to afford certain oxo-subsituted bicyclo[2.2.2]octane species. The process of the invention thus affords a novel and simplified means for the commercial production of a wide variety of bicyclo[2.2.2]octane derivatives.
Diastereomerically pure tranexamic acid has been prepared via a diastereomeric separation of a trans-/cis-mixture of 1, 4-cyclohexanedimethanol using lipase PS (Pseudomonas sp. Amino).
Extended Release of Native Drug Conjugated in Polyketal Microparticles
作者:Shutao Guo、Yoshiyuki Nakagawa、Aoune Barhoumi、Weiping Wang、Changyou Zhan、Rong Tong、Claudia Santamaria、Daniel S. Kohane
DOI:10.1021/jacs.6b02435
日期:2016.5.18
particles had high drug loading and significantly prolonged drugrelease. Release of estradiol from the drug-polyketal conjugate microparticles was acid-responsive, as evidenced by faster drugrelease at low pH and with co-incorporation of PLGA. Tissue reaction to the microparticles was benign in vivo. Polyketal drug conjugates are promising candidates for long-acting drugdelivery systems to treat chronic