PROCESS FOR PREPARIING 1,3-DIBROMOACETONE, 1-3-DICHLOROACETONE AND EPICHLOROHYDRIN

WIPO Patent Application WO2005115954

A3

A process for preparing 1,3-dibromoacetone, 1-3-dichloroacetone and epichlorohydrin which comprises: (a) reacting acetone with 2 moles of bromine to make a mixture of brominated acetone derivatives and byproduct hydrogen bromide; (b) equilibrating the mixture of brominated acetone derivatives and hydrogen bromide to produce 1,3-dibromoacetone as the major product; (c) crystallizing the 1,3-dibromoacetone; and (d) isolating the 1,3-dibromoacetone. The process may further include the steps of (e) reacting the 1,3-dibromoacetone with a chloride source to produce 1,3-dichloroacetone; (f) hydrogenating the isolated 1,3-dichloroacetone to produce 1,3-dichlorohydrin; and (g) cyclizing the 1,3-dichlorohydrin with a base to produce epichlorohydrin.

JPH08512286	INDUSTRIAL APPLICABILITY: N-fluorosulfonimide, a method for producing the same, and its use as a fluorination reagent.
JPS54125667	TRIAZOLE OR IMIDAZOLE DERIVATIVE*ITS MANUFACTURE AND HERBICIDAL COMPOSITION CONTAINING SAID DERIVATIVE

DAVIS CLARK S (US)

PCT/US2005/017193

March 16, 2006

May 17, 2005

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DOW GLOBAL TECHNOLOGIES INC (US)
DAVIS CLARK S (US)

C07C45/63; C07C45/81; C07D301/26; (IPC1-7): C07C45/63; C07D301/26; C07D49/16

DATABASE WPI Section Ch Week 199118, Derwent World Patents Index; Class B05, AN 1991-130614, XP002341430
YU M ET AL: "SELECTIVE MONOBROMINATION OF KETONES BY BIS(DIMETHYLACETAMIDE) HYDROGEN TRIBROMIDE", RUSSIAN JOURNAL OF ORGANIC CHEMISTRY, CONSULTANTS BUREAU, US, vol. 30, no. 6 PART 1, 1 June 1994 (1994-06-01), pages 881 - 887, XP000497842, ISSN: 1070-4280
WEYGAND, F. AND SCHMIED-KOWARZIK, V.: "Weitere Folinsäure-Synthesen", CHEM. BER.; 82, 1949, pages 333 - 336, XP009052686

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