Environmental Science and Technology p. 4029 - 4033 (1999)
Update date:2022-08-05
Topics:
Mcgraw, Gerald W.
Hemingway, Richard W.
Ingram Jr., Leonard L.
Canady, Catherine S.
Mcgraw, William B.
Emissions from wood dryers have been of some concern for a number of years, and recent policy changes by the Environmental Protection Agency have placed emphasis upon the gaseous emissions that lead to the formation of particulate matter as small as 2.5 μm diameter. In this qualitative study, camphene, Δ3-carene, limonene, and α-terpinene were thermally degraded in the presence of air to determine the number and kind of oxidative degradation products that might be expected under drying conditions used in processing wood products. Various chromatographic methods were used to isolate the products for proof of structure by NMR and/or GC-MS. The degradation products resulted from dehydrogenations, epoxidations, double bond cleavages, allylic oxidations, and rearrangements. A number of compounds not previously associated with the thermal degradation of these terpenes were identified. Emissions from wood dryers have been of some concern for a number of years, and recent policy changes by the Environmental Protection Agency have placed emphasis upon the gaseous emissions that lead to the formation of particulate matter as small as 2.5 μm diameter. In this qualitative study, camphene, Δ3-carene, limonene, and α-terpinene were thermally degraded in the presence of air to determine the number and kind of oxidative degradation products that might be expected under drying conditions used in processing wood products. Various chromatographic methods were used to isolate the products for proof of structure by NMR and/or GC-MS. The degradation products resulted from dehydrogenations, epoxidations, double bond cleavages, allylic oxidations, and rearrangements. A number of compounds not previously associated with the thermal degradation of these terpenes were identified.
View MoreAnhui Biochem United Pharmaceutical Co., Ltd.
Contact:0086 551 5167062 / 5228268
Address:No. 30 Hongfeng Road, Hi-Tech Development Zone, Hefei (230088), China
Jiaxing Taixin Pharmaceutical Chemical Co., Ltd
Contact:0573-82613601
Address:Chemical Park, Jiaxing, Zhejiang, China
Contact:+86-22-83718541
Address:32th Floor, Rongqiao Center Intersection of Changjiang Road and Nankai Six Road Nankai District Tianjin 300102, China
Hebei Tianxiang Biological & Pharmaceutical Co., Ltd
Contact:86-0312-6615158
Address:No 42 fazhan street qingyuan county
Contact:+852-8198 2399
Address:9E, Leapont Industrial Building, 18-28 Wo Liu Hang Road, Shatin, New Territories, Hong Kong
Doi:10.1021/acs.orglett.9b03414
(2019)Doi:10.3987/COM-92-5999
(1992)Doi:10.1021/np970449e
(1998)Doi:10.1016/S0040-4039(00)61688-X
(1993)Doi:10.1021/ja01576a062
(1957)Doi:10.1002/jlcr.2580150142
(1978)