| abstract |
Patent Application: "Process for the production of pyridazinone compound and its production intermediates". The present invention provides a process for the production of a compound of formula (1) wherein x represents a hydrogen atom, etc., and y represents a hydrogen atom, etc., which comprises step 1 of reacting a compound of the formula. formula (2) and a compound of formula (3) in the presence of a lewis acid wherein r represents a hydrogen atom, etc., to obtain an addition product, and the reaction step 2 of the obtained addition product in step 1 and hydrazine to obtain the compound of formula (1). |