91171-21-0

Upstream product

• 120-83-2 2,4-dichlorophenol 
• 112438-61-6 1,1-Bis-(2,4-dichloro-phenoxy)-3,3-dimethyl-butan-2-one 
• 91171-09-4 1,1-Bis-(2,4-dichloro-phenoxy)-3,3-dimethyl-butan-2-ol 

Downstream Products

• 95059-87-3 1-[(E)-1-(2,4-Dichloro-phenoxy)-3,3-dimethyl-but-1-enyl]-1H-[1,2,4]triazole 
• 83724-27-0 1-[(E)-1-(2,4-Dichloro-phenoxy)-3,3-dimethyl-but-1-enyl]-1H-[1,2,4]triazole 

Relevant academic research and scientific papers

A Facile Synthesis of Ketene O,N-Acetals and Ketene O,O-Acetals by Tosylate Elimination

Reaction of the alcohols 4 and 5 with p-toluensulfonyl chloride leads to the sulfonic esters 6 and 7, respectively, which on treatment with potassium tert-butylate easily react to give the ketene O,N-acetals 8 and O,O-acetals 9, respectively.The (E/Z) isomers 8 arising from the elimination reaction of 7 were identified by their 1H-NMR data after X-ray analysis of one of the isomers of 8e.On one example it is shown that the elimination reaction proceeds stereoselectively "anti".

Preparation of ketene O,O-acetals

Ketene O,O-acetals which can be converted in a simple manner to fungicidal ketene O,N-acetals are prepared by an addition reaction of a phenol with a phenoxyalkyne.

Ketene O,O-acetals and their preparation

Useful novel ketene O,O-acetals of the formula I STR1 where R1 is a tertiary alkyl radical of 4 to 6 carbon atoms or unsubstituted or halogen-substituted phenyl, R2 is hydrogen and R3 and R4 independently of one another are each phenyl which is unsubstituted or substituted by halogen, alkoxy, alkyl, phenyl, phenoxy, cyano, nitro or trifluoromethyl, their preparation and their use for the preparation of ketene O,N-acetals.