00430nam a22001217a 4500020000900000082001300009100001800022245004700040260003500087300003300122500006300155650009000218  a(hb)  a547bULR  aUlrich, henri10aCycloaddition reactions of heterocumulenes  aNew YorkbAcademic Pressc1967  aix, 364 p.b: ill.c; 24 cm.  aIncludes appendices, bibliographical references and index.  aOrganic dandify vCycloaddition rationsvCarbon suboxide vIsocyanatesvKetenesvRIPS