Described are bicyclic lactones, both fused ring lactones defined according to the generic structure: ##STR1## and spiro lactones defined according to the generic structure: ##STR2## uses thereof in augmenting, enhancing or imparting aromas in or to perfume compositions, perfumed articles, colognes and perfumed polymers; processes for preparing such bicyclic lactones and intermediates therefor. In the structure: ##STR3## Z is one of the moieties: ##STR4## one of R.sub.1 or R.sub.3 is methyl and the other is hydrogen; and R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are hydrogen or nonadjacent C.sub.1 -C.sub.3 alkyl. In the structure: ##STR5## Y represents C.sub.2 -C.sub.12 substituted or unsubstituted alkylidenyl, alkenylidenyl or alkadienylidenyl having the structure: ##STR6## and completes a C.sub.5 -C.sub.15 cycloalkyl, cycloalkadienyl or cycloalkenyl ring moiety; and wherein R.sub.12, R.sub.13, R.sub.14, R.sub.16, R.sub.17, R.sub.28, R.sub.29, R.sub.30 and R.sub.31 represent hydrogen or nonadjacent alkyl; wherein s is an integer of from 0 up to 10; t is an integer of from 0 up to 10; and v is an integer of 1 or 2; with the proviso that the sum of s and t is between 0 and 10 according to the inequalities: 0.ltoreq.s+t.ltoreq.10;0.ltoreq.s.ltoreq.; 10; and 0 .ltoreq.t.ltoreq.10.

São descritos os lactones bicyclic, ambos os lactones fundidos do anel definidos de acordo com a estrutura genérica: ## do ## STR1 e lactones do spiro definidos de acordo com a estrutura genérica: ## do ## STR2 usos disso em aumentar, em realçar ou em dar aromas em ou para perfumar composições, artigos perfumados, colognes e polímeros perfumados; processos para preparar tais lactones e intermediários bicyclic therefor. Na estrutura: ## do ## STR3 Z é um dos moieties: ## do ## STR4 um de R.sub.1 ou de R.sub.3 é methyl e o outro é hidrogênio; e R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8 e R.sub.9 são hidrogênio ou C.sub.1 nonadjacent - alkyl C.sub.3. Na estrutura: ## do ## STR5 Y representa C.sub.2 - C.sub.12 substituído ou alkylidenyl, alkenylidenyl ou alkadienylidenyl unsubstituted tendo a estrutura: ## do ## STR6 e termina um C.sub.5 - moiety do anel do cycloalkyl C.sub.15, do cycloalkadienyl ou do cycloalkenyl; e wherein R.sub.12, R.sub.13, R.sub.14, R.sub.16, R.sub.17, R.sub.28, R.sub.29, R.sub.30 e R.sub.31 representam o hidrogênio ou o alkyl nonadjacent; wherein s é um inteiro de 0 até 10; t é um inteiro de 0 até 10; e v é um inteiro de 1 ou de 2; com o proviso que a soma de s e de t é entre 0 e 10 de acordo com os desigualdades: 0.ltoreq.s+t.ltoreq.10;0.ltoreq.s.ltoreq.; 10; e 0 ltoreq.t.ltoreq.10.

 
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