Two dimeric monoterpenes obtusal A and B, and two dimeric diterpenes obtusanol A and B, along with (À)-(S)-citronellol, (À)-(S)-citronellic acid, ()-borneol, ()-sugiol, and (À)-6,12-dihydroxyabieta-5,8,11,13tetraen-7-one, have been isolated from the heartwood of Chamaecyparis obtusa var. formosana and were characterized by spectroscopic means, including 2D-NMR techniques and chemical methods. Synthesis of (À)obtusal A and ()-obtusal B were carried out.
The mass spectra of a series of substituted butenolides were studied. Their fragmentations in Utemass spectrometer strongly depend upon the nature of the substitutents. The fragment's ions include the lactone skeletons, substituents, and resultant derived from the loss of a carbon dioxide from lactone.
8‐Cedren‐14‐ol (4d) was oxidized with PCC, followed by autooxidation to yield 8,14‐cedranolide (2a) and 8‐cedren‐14‐carboxylic peracid (4e). 8β‐Hydroxycedran‐l3‐al (1d) was subjected to autooxidation in three different solvents to give eight products, from which the transformation from cedrane skeleton to noracorane and decahydroazulene skeletons were observed. A free radical pathway was proposed.
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