<prompt> Yakha inguqulo eyinkimbinkimbi yalesi sigwebo Ukuhlelwa kabusha kukaClaisen kuqhutshwa ngokushisa i-allylic alcohols lapho kukhona N, N - dimethylacetamide dimethyl acetal ukwakha γ, δ - unsaturated amide.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi ukuhlelwa kabusha kukaClaisen kuqhubekela phambili kusuka ku-allylic alcohol kuya ku-γ, δ - unsaturated amide, futhi yathuthukiswa ngu-Albert Eschenmoser ngo-1964. 