7571-04-2

Basic information

• Product Name: 3,4-dihydro-2H-benzo[h]thiochromene
• CAS NO: 7571-04-2
• Molecular Formula: C₁₃H₁₂S
• Molecular Weight: 200.2994
• Mol File: 7571-04-2.mol
• Article Data: 1

Chemical Properties

• Boiling Point: 355.6°C at 760 mmHg
• Flash Point: 167.7°C
• Density: 1.179g/cm³
• Vapor Pressure: 6.35E-05mmHg at 25°C
• Refractive Index: 1.683
• CAS DataBase Reference: 3,4-dihydro-2H-benzo[h]thiochromene(CAS DataBase Reference)
• NIST Chemistry Reference: 3,4-dihydro-2H-benzo[h]thiochromene(7571-04-2)
• EPA Substance Registry System: 3,4-dihydro-2H-benzo[h]thiochromene(7571-04-2)

Safety Data

• Hazardous Substances Data: 7571-04-2(Hazardous Substances Data)

Upstream product

• 51621-72-8 allyl 1-naphthyl sulfide 

Relevant articles and documents

[3,3]-Sigmatropic rearrangement of allyl and 2-butenyl 1-naphthyl sulfides

The [3,3]-sigmatropic rearrangement of alkenyl 1-naphthyl sulfides in solutions with various polarities was investigated at 138-190 °C. The reaction proceeds through the formation of 2-alkenyl-1-naphthalene thiols, which subsequently undergo cyclization to compounds of the 2,3-dihydronaphtho[1,2-b]thiophene and naphtho[1,2-b]dihydrothiopyran series. 2-Butenyl 1-naphthyl sulfide, in addition to its passing directly through a [3,3]-sigmatropic rearrangement, to a considerable extent undergoes a prior [1,3]-sigmatropic rearrangement, which ultimately leads to the formation of four cyclic products. The kinetic parameters of the rearrangement of the sulfides were determined. The more negative entropies of activation constitute evidence for the high symmetry of the transition state.