Selective Cleavage of N-Benzyl-Protected Secondary Amines by Triphosgene
摘要:
A series of competition experiments has revealed that selective cleavage of N-benzyl-protected secondary amines can be achieved with triphosgene, thereby providing a useful range of carbamoyl chlorides.
The invention relates to a method for producing isocyanates by reacting the corresponding primary amines with phosgene in the gas phase, wherein the phosgene is injected into the gaseous amine flow in the interior of the flow tube via an outer ring channel and through several radial channels in an angle of ≦90° relative to the flow direction of the gaseous amine flow, wherein a static mixer of the KENICS type is provided coaxially in the interior of the flow tube.
Benzazepinyl sulfonylureas and intermediates therefore
申请人:Hoffmann-La Roche Inc.
公开号:US04024128A1
公开(公告)日:1977-05-17
Sulfonylurea derivatives of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are as hereinafter set forth, ARE DESCRIBED. The sulfonylurea derivatives are useful as hypoglycemic agents.
PENTAMETHYLENE DIISOCYANATE, METHOD FOR PRODUCING PENTAMETHYLENE DIISOCYANATE, POLYISOCYANATE COMPOSITION, POLYURETHANE RESIN, AND POLYUREA RESIN
申请人:Mitsui Chemicals, Inc.
公开号:EP2684867A1
公开(公告)日:2014-01-15
A Pentamethylene diisocyanate is obtained by phosgenating pentamethylenediamine or its salt obtained by a biochemical method, and contains 5 to 400 ppm of a compound represented by the general formula (1) below and a compound represented by the general formula (2) below in total: