Kaiser, Roman published the artcileThe (5R*,9S*)- and (5R*,9R*)-2,2,9-trimethyl-1,6-dioxaspiro[4.4]non-3-ene and their dihydro derivatives as new constituents of geranium oil, Formula: C10H16O2, the publication is Helvetica Chimica Acta (1984), 67(5), 1198-203, database is CAplus.
(5R ,9S )- (I) [92356-08-6] and (5R ,9R )-2,2,9-trimethyl-1,6-dioxaspiro[4.4]non-3-ene (II) [92356-04-2] and their dihydro derivatives, III [92356-09-7] and IV [92356-10-0], were isolated from geranium oil and their structures determined by spectra and synthesis. Other trace monoterpenes such as nerol oxide [1786-08-9] were also isolated.
Helvetica Chimica Acta published new progress about 27943-46-0. 27943-46-0 belongs to tetrahydropyran, auxiliary class Tetrahydropyran,Alkynyl,Ether, name is 2-((2-Methylbut-3-yn-2-yl)oxy)tetrahydro-2H-pyran, and the molecular formula is C10H16O2, Formula: C10H16O2.
Referemce:
https://en.wikipedia.org/wiki/Tetrahydropyran,
Tetrahydropyran – an overview | ScienceDirect Topics