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

Abstract of the disclosure: 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 cyclicacetal of 3-methyl-but-3-en-1-al with an alkyl nitritein the presence of methanol and hydrogen chloride and,if desired, eliminating HCl in the conventional manner.The butan-dial-bis-acetals and butenedial-bis-acetals are valuable intermediates through which thetrans-3-methyl-but-2-ene-1,4-dial-1-ecetals, which aresought-after products for terpene syntheses, can be ob-tained in an industrially particularly advantageousmanner.