摘要:
The present invention provides bio-based aromatic diisocyanate of formula (I). [Formula should be inserted here] wherein X is –OCH 3 , Y is selected from -H or –OCH 3 , and m = 0-12. The present invention further provides a method for preparation of aromatic diisocyanate of formula (I) useful for preparation of polyurethane.
摘要:
The present invention relates to a process for producing isocyanates which comprises reacting an N-halogenated amide with an organic base in an essentially water-free modified Hofmann reaction using a soluble silver salt promoter in the presence of an organic solvent. Also disclosed is a process for producing a carbamate which comprises reacting an N-halogenated amide with an organic base in an essentially water-free modified Hofmann reaction using a soluble silver salt promoter in the presence of an alcohol solvent.
摘要:
The invention concerns the use of isocyanates obtained from amino acid derivatives for preparing and optionally isolating stable activated carbamic acid derivatives, or stable activated carbamates.
摘要:
The disclosure provides, inter alia, safe and environmentally-friendly methods, such as flow chemistry, to synthesize isocyanates, such as methylene diphenyl diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and tetramethylxylene diisocyanate.
摘要:
Disclosed are a novel fluoroadamantane derivative and a method for producing the same. Specifically disclosed are a method for producing a compound (2) shown below wherein a compound (1) shown below is reacted with an azide and then subjected to a heat treatment; a compound (2a) shown below; a method for producing an adamantane derivative wherein the compound (2a) is addition-reacted with a hydroxy compound; a method for producing an adamantane derivative wherein the compound (2a) is addition-reacted with an amine compound; a method for producing a compound (3) shown below wherein the compound (2a) is hydrolyzed; and a compound (3a) shown below. In this connection, Q represents -CHF- or -CF 2 -; X represents H, F or COF; Y represents a group corresponding to X; Y a represents H, F or NCO; Z represents a group corresponding to Y a ; and Z a represents H, F or NH 2 .