Gao, Bo et al. published their research in Environmental Science & Technology in 2015 | CAS: 205-39-0

Naphtho[2,1-b]benzofuran (cas: 205-39-0) belongs to benzofurans derivatives. Benzofuran derivatives are one of the most important oxygen-containing heterocycles. They are also prone to polymerisation in the presence of concentrated mineral acids and Lewis acids.Formula: C16H10O

Parent, Alkylated, and Sulfur/Oxygen-Containing Polycyclic Aromatic Hydrocarbons in Mainstream Smoke from 13 Brands of Chinese Cigarettes was written by Gao, Bo;Du, Xueqing;Wang, Xinming;Tang, Jianhui;Ding, Xiang;Zhang, Yanli;Bi, Xinhui;Zhang, Gan. And the article was included in Environmental Science & Technology in 2015.Formula: C16H10O This article mentions the following:

China has the world’s largest population of smokers with serious health consequences, yet the authors know a very limited spectrum of hazardous chems. in cigarette smoke even for carcinogenic polycyclic aromatic hydrocarbons (PAHs). Here, the authors chose 13 popular cigarette brands sold in China markets, collected particulate matters in mainstream smoke using filter pads and an automatic smoking machine, and analyzed 56 PAHs, including 31 parent, 18 alkylated, and 7 sulfur/oxygen-containing PAHs (S/O PAHs). The 56 PAHs in mainstream smoke totaled from 244.2 to 10254.8 ng cig-1; parent, alkylated, and S/O PAHs shared 16-23%, 64-74%, and 6-18%, resp. Benzo[a]pyrene (BaP) ranged 1.1-41.6 ng cig-1, while BaP equivalent concentrations (BaPeq) ranged 3.6-120.2 ng cig-1, but contributions to BaPeq by individual carcinogenic PAH species varied with cigarette brands. When these cigarette smoke source profiles were pooled together with those of other combustion ones available in the literature, the authors found that widely used diagnostic ratios of parent PAHs failed to distinguish cigarette smoke from other combustion sources, except that the ratio indeno[1,2,3-cd]pyrene/(indeno[1,2,3-cd]pyrene + benzo[g,h,i]perylene) can largely sep. cigarette smoke from vehicular emissions and that the ratio of Retene/(Retene + chrysene) can further discriminate cigarette smoke from coal combustion when alkylated PAHs are involved. In the experiment, the researchers used many compounds, for example, Naphtho[2,1-b]benzofuran (cas: 205-39-0Formula: C16H10O).

Naphtho[2,1-b]benzofuran (cas: 205-39-0) belongs to benzofurans derivatives. Benzofuran derivatives are one of the most important oxygen-containing heterocycles. They are also prone to polymerisation in the presence of concentrated mineral acids and Lewis acids.Formula: C16H10O

Referemce:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem