US 12,415,769 B2
Vinylether compounds and processes for preparing aldehyde compounds and a carboxylate compound therefrom
Takeru Watanabe, Joetsu (JP); and Takeshi Kinsho, Joetsu (JP)
Assigned to Shin-Etsu Chemical Co., Ltd., Tokyo (JP)
Filed by Shin-Etsu Chemical Co., Ltd., Tokyo (JP)
Filed on Jul. 11, 2022, as Appl. No. 17/861,622.
Claims priority of application No. 2021-115859 (JP), filed on Jul. 13, 2021.
Prior Publication US 2023/0014797 A1, Jan. 19, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C07C 45/42 (2006.01); C07C 29/14 (2006.01); C07C 41/30 (2006.01); C07C 45/51 (2006.01); C07C 45/62 (2006.01); C07C 67/08 (2006.01)
CPC C07C 45/42 (2013.01) [C07C 29/14 (2013.01); C07C 41/30 (2013.01); C07C 45/513 (2013.01); C07C 45/62 (2013.01); C07C 67/08 (2013.01); C07B 2200/07 (2013.01); C07C 2601/08 (2017.05); C07C 2601/10 (2017.05)] 11 Claims
 
1. A process for preparing 2,3,4,4-tetramethyl-1-cyclopentenecarbaldehyde of the following formula (2), the process comprising
subjecting a vinylether compound of the following general formula (1) to a hydrolysis reaction to form 2,3,4,4-tetramethyl-1-cyclopentenecarbaldehyde (2)

OG Complex Work Unit Chemistry
wherein in the general formula (1), R1 represents a monovalent hydrocarbon group having 1 to 15 carbon atoms, and the wavy line represents the E-form, the Z-form, or a mixture thereof.