137300-37-9

Upstream product

• 137300-36-8 3,5-Bis<2-(bromomethyl)-6-methylphenyl>biphenyl 
• 135990-00-0 3,5-dibromo-4-iodobiphenyl 
• 137300-35-7 3,5-Bis<2-(methoxymethyl)-6-methylphenyl>biphenyl 
• 3366-59-4 4-amino-3,5-dibromo-1,1'-biphenyl 

Downstream Products

• 137300-39-1 9,10-Dihydro-5,14-dimethyl2-2phenyltribenzocyclooctene 

Relevant academic research and scientific papers

Photoisomerization of 2,2"-Ethano-Bridged m-Terphenyl Derivatives: Ring Constraint Activates an Unreactive Chromophore

The photochemistry of 2,2"-ethano-bridged m-terphenyl derivatives 4, 8, and 9 was investigated.These compounds are chiral and may be suitable photoresolvable additives to discotic liquid crystals.Unlike their unbridged analogues, 4, 8, and 9 rearrange rapidly when irradiated with UV light to the o-terphenyl compounds 10,11, and 12, respectively.This rearrangement is likely to proceed through an intermediate benzvalene valence-bond isomer.The high reactivity of the 2,2"-ethano-bridged compounds is attributed to distortion in their lowest excited singlet states and to the relief of strain when the ortho isomers are formed.