3-Chloro-3-methyl-butane-1,4-dial-bis-acetals and 3-methyl-but-2- ene-1,4- dial-bis-acetals, a process for the preparation of these compounds and their use

摘要

3-Chloro-3-methyl-butane-1,4-dial-bis-acetals and 3-methyl-but- 2-ene- 1, 4-dial-bis-acetals are obtained by reacting a six-membered cyclic acetal of 3-methyl-but-3-en-1-al with an alkyl nitrite in the presence of methanol and hydrogen chloride and, if desired, eliminating HCl in the conventional manner.PPThe butanedial-bis- acetals and butenedial-bis- acetals are valuable intermediates through which the trans- 3-methyl-but-2-ene-1,4-dial-1-acetals, which are sought- after products for terpene syntheses, can be obtained in an industrially particularly advantageous manner.