1.4- diyl

Methyl 2,3-(buta-1,3-diene-1,4-diyl)-2,3-dideoxy-p-D-eryfhro-hex-2-enopyranoside... 

The effects of temperature on the shape of intervalence charge-transfer bands for the radical cations of bis(2-f-butyl-2,3-diazabicyclo[2.2.2]oct-3-yl)hydrazines that are bridged by 2,5-xylene-1,4-diyl, durene-l,4-diyl, naphthalene-1,4-diyl, biphenyl-4,4-diyl and 9,9-dimethylfluorene-2,7-diyl aromatic rings were studied by ESR. ... 

The 1,4-diphenylbutane-1,4-diyl biradical (157) was generated from 1,4-dichloro-1,4-diphenylbutane or 2,5-diphenylcyclopentanone under irradiation conditions giving rise to styrene, 1,2-diphenylcyclobutane, and l-phenyl-l,2,3,4-tetrahydronaphthalene. " Tetrahydronaphthalene forms from 1,4-biradicals that have a phenyl group attached to one of the radical centres. Irradiation of 2-phenylcyclopentanone resulted in the formation of tetrahydronaphthalene. 

For example, EPR evidence showed that cyclohexane-1,4-diyl, generated by radiolysis of hexadiene, rearranged to cyclohexene radical cation. Similarly, ant/-5-methylbicyclo[2.1.0]-pentane radical cation (33) rearranged to 1-methylcy-clopentene radical cation (34) via a 1,2-shift of the syn-5-hydrogen. ... 

Note The preferred representation is with the double bond in the 1-position, i.e. that which corresponds to the name poly[( )-l-methylbut-1-ene-1,4-diyl] [2]. 

Note The buta-1,3-diene is exclusively incorporated by 1,4-addition which cannot be reflected in the source-based name. The strueture-based name (see [5]) is [deea(but-2-ene-1,4-diyl)]methyl[pentadeea(but-2-ene-1,4-diyl)][poly(2-phenylethylene)]silane... 

D. Unsaturation is senior to saturation. The more the unsaturation, the greater the seniority, with all other items being equal. Thus, 1,4-phenylene is senior to 2,5-cyclohexadiene-l,4-diyl, which is senior to 2-cyclohexene-1,4-diyl, which in turn is senior to cyclohexane-1,4-diyl. For linear chains-CH=CH—CH=CfU is senior to-CH=CH—CH2-CH2-which is in turn senior to the totally saturated chain segment. 

D. Where there is no conflict with other guidelines, triple bonds are senior to double bonds, which in turn are senior to single bonds multiple bonds should be assigned the lowest possible locants. Thus, the polymer from 1,3-butanediene polymerized in the 1,4- mode is usually indicated as-(—C—C=C—C — )-but is named as though it were-( - C=C - C - C - )-and named poly(l-butene-1,4-diyl) with the appropriate cis- or tra i-designation. Polyisoprene, typically drawn as-(—CH2 —C(CH3)=CH—CH2 —) —is frequently named poly(2-methyl-1,3-butadiene) but is named as though its structure were-(C(CH3)=CH—CH2—CH2 — ) —with the namepoly(l-methyl-1 -butene-1,4-diyl). 

Poly 1,2-dioxo-1,4-butanediyl Poly(3-methyl-1 -butene-1,4-diyl)... 

R and R groups and an all-trans arrangement of the double bonds. The polymer is named transerythrodiisotactic 1,4-poly (methyl sorbate) or diisotactic poly[eryr/tro-3-(methoxycar-bonyl)-4- -methylbut-1 -ene-1,4-diyl]. 

Dimethylhexane-2,5-diyl dication 231 Bicyclo[2.2.2]octane-l,4-diyl dications 231 Cyclohexane-1,4-diyl dications 232... 

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