4740-52-7

Basic information

• Product Name: 1,1':2',1'':2'',1''':2''',1'''':2'''',1'''''-Sexiphenyl
• Synonyms: o-Sexiphenyl(6CI,7CI,8CI); 1,1'-Biphenyl, 2,2'-bis([1,1'-biphenyl]-2-yl)-;1,1':2',1'':2'',1'''-Quaterphenyl, 2,2'''-diphenyl-
• CAS NO: 4740-52-7
• Molecular Formula: C36H26
• Molecular Weight: 458.602
• Mol File: 4740-52-7.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: 1,1':2',1'':2'',1''':2''',1'''':2'''',1'''''-Sexiphenyl(CAS DataBase Reference)
• NIST Chemistry Reference: 1,1':2',1'':2'',1''':2''',1'''':2'''',1'''''-Sexiphenyl(4740-52-7)
• EPA Substance Registry System: 1,1':2',1'':2'',1''':2''',1'''':2'''',1'''''-Sexiphenyl(4740-52-7)

Safety Data

• Hazardous Substances Data: 4740-52-7(Hazardous Substances Data)

Upstream product

• 1338363-01-1 [1,1':2',1-terphenyl]-2-yl trifluoromethanesulfonate 
• 1338363-02-2 C₃₁H₂₁F₃O₃S 
• 98-80-6 phenylboronic acid 
• 14205-96-0 dibenzo[c,e][1,2]oxaborinin-6-ol 
• 90-43-7 2-Phenylphenol 
• 4731-96-8 2-hydroxy[1,1':2',1]terphenyl 
• 1454-80-4 1,1'-biphenyl-2,2'-diamine 
• 2436-96-6 1-nitro-2-(2-nitrophenyl)benzene 
• 82214-69-5 2-biphenylmagnesium bromide 
• 2236-52-4 2,2'-diiodobiphenyl 
• 39655-15-7 2-iodo-1,1':2',1''-terphenyl 
• 2113-51-1 2-iodobiphenyl 
• 16291-37-5 2,2'''''-diiodo-[1,1';2',1'';2'',1''';2''',1'''';2'''',1''''']sexiphenyl 
• 16291-32-0 biphenyl-2,2'-diyl-bis-lithium 

Relevant articles and documents

Parent o-phenylene oligomers: Synthesis, conformational behavior, and characterization

The o-phenylenes are an unusual class of conjugated polymer, defined largely by substantial steric twisting along their backbones. Consequently, they exhibit limited conjugation but also interesting conformational behavior: they have been shown to adopt well-defined helical secondary structures, both in the solid state and in solution. While several examples of functionalized o-phenylene oligomers have been reported, most of the basic properties of the parent compounds are unknown. Here we report the synthesis and characterization of the series of unsubstituted o-phenylene oligomers up to the octamer. Through a combination of NMR spectroscopy, including dynamic NMR (EXSY), and computational chemistry, we have found that these compounds adopt compact helical conformations in solution with three repeat units per turn. Although formally conjugated, the oligomers have a very short effective conjugation length of necl ≈ 4 (based on UV-vis spectra), significantly shorter than most other conjugated systems. Also, unlike other (substituted) o-phenylenes, no hypochromicity is observed in their UV-vis spectra. The fluorescence spectra of the series exhibit a systematic blue shift with increasing length. We believe this unusual property results from increased steric congestion in the longer oligomers, which are therefore less able to accommodate structural relaxation in the excited state.

Syntheses and Physical Properties of Several Symmetrical Sexiphenyls

Seven sexiphenyls, including three new isomers, 3,4,3',4'-tetraphenylbiphenyl (Id), 2,5,2',5'-tetraphenylbiphenyl (IIId), and 2,2'-di(3-biphenylyl)biphenyl (Vd), were synthesized by Ullmann homo-coupling of iodoterphenyl.The characteristic band of the infrared spectra (675-920 cm-1) and signals of the nuclear magnetic resonance spectra of the sexiphenyls were assigned tentatively and are discussed briefly.Infrared studies indicated that the range 730-770 cm-1, generally accepted as the position of the C-H out-of-plane bending bands of phenyl rings, should be widened slightly to 730-782 cm-1.The ultraviolet spectra commonly displayed an intense E-band in the narrow region of 192-207 nm.The prominent K-band above ca. 260 nm of branched sexiphenyls was taken as indicative of the presence of one or more p-linkages, as in the case of linear compounds.Keywords - polyphenyls; Ullmann reaction; infrared spectra; ultraviolet spectra; NMR spectra; iodoterphenyls