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Carboxylic acid
About: Carboxylic acid is a research topic. Over the lifetime, 48544 publications have been published within this topic receiving 605696 citations.
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10 Aug 1994TL;DR: Aminoxyl-containing radical is provided in polymers and copolymers by replacing a hydroxyl moiety in a carboxyl group at the chain end of a starting material biodegradable polymer or copolymer with imino or oxy linked to aminoxylcontaining radical to form an amide linkage or an oxycarbonyl linkage at the end of biocompatible polymers as mentioned in this paper.
Abstract: Aminoxyl-containing radical is provided in polymers and copolymers by replacing a hydroxyl moiety in a carboxyl group at a chain end of a starting material biodegradable polymer or copolymer with imino or oxy linked to aminoxyl-containing radical to form an amide linkage or an oxycarbonyl linkage at the chain end of biocompatible polymers or copolymers to the aminoxyl-containing radical. Preferred starting material polymers and copolymers are prepared from the hydroxy alkyl carboxylic acid monomers glycolic acid and lactic acid. Preferred aminoxyl-containing radical is 2,2,6,6-tetramethylpiperidine-1-oxy. Product polymers are useful for aminoxyl-containing radical treatment of tumors, and to increase the efficiency of chemotherapy and ionizing radiation therapy of tumors and for the reconstruction of injured, diseased, or aged human blood vessels.
140 citations
TL;DR: In this paper, a polycrystalline silicalite membrane was obtained on two kinds of porous supports by hydrothermal synthesis and the pervaporation performance of the membrane obtained was investigated using an acetic acid-water mixture as a feed.
140 citations
TL;DR: The palladium-catalyzed direct alkynylation of C-H bonds in aromatic carboxylic acid derivatives is described and the use of 8-aminoquinoline as a directing group facilitates the alkynYLation of an electronically diverse range of C(sp(2))-H Bonds.
139 citations
TL;DR: In this paper, the rates of nine melt coupling reactions were measured by reacting terminally functional polymer chains with most experiments performed at molecular weights of about 25,000 g/mol and temperature of 180°C.
139 citations
TL;DR: This is the first cobalt-catalyzed hydrogenation of esters to the corresponding alcohols, and the evidence indicates the unprecedented involvement of ester enolate intermediates.
Abstract: The atom-efficient and environmentally benign catalytic hydrogenation of carboxylic acid esters to alcohols has been accomplished in recent years mainly with precious-metal-based catalysts, with few exceptions. Presented here is the first cobalt-catalyzed hydrogenation of esters to the corresponding alcohols. Unexpectedly, the evidence indicates the unprecedented involvement of ester enolate intermediates.
139 citations