Bond distances allene

The three carbons of allene he in a straight line with relatively short carbon-carbon bond distances of 131 pm The central carbon because it bears only two substituents is sp hybridized The terminal carbons of allene are sp hybridized... 

Carbon-Carbon Bond Distances. The Electron Diffraction Investigation of Ethane, Propane, Isobutane, Neopentane, Cyclopropane, Cyclopentane, Cyclohexane, Allene, Ethylene, Isobutene, Tetramethylethylene, Mesitylene, and Hexamethylbenzene. 

Values found for interatomic distances and bond angles in the thirteen hydrocarbons studied are given in Table XIV. The carbon-carbon singlebond distance is found to have the constant value 1.54 = = 0.02 A., being unaffected by the presence of an adjacent double bond or benzene nucleus (provided that it does not form part of a conjugated system). The carbon-carbon double-bond distance in allene and acetylene has the value 1.34 A. This is 0.04 A. less than that formerly given by the table of covalent radii, which has accordingly been revised. The effect of the revision on the bond distance-resonance curve is discussed. 

The average C—C bond distance in aromatic rings is 1.38 A Allen Kennard Watson Brammer Orpen Taylor J. Chem. Soc., Perkin Trans. 2 1987, p. S8. 

Typical C—Cl bond distances in crystals were derived by Allen and coworkers172 using the same procedure described for fluorine compounds. The substructures chosen for the chlorine compounds (Table 29) differ slightly from those for fluorine derivatives. Since... 

Crystal structures for some iodine-substituted compounds were selected from the CSD according to the same criteria applied for chlorine and bromine compounds, except that the number of iodine atoms [criterion (a)] was relaxed to > 1. This search resulted in 18 observations for C(sp3)—I bonds with a mean value of 216.6 pm and o = 2.0 pm. The individual values range from 212.3 to 220.6 pm. 34 observations were listed for C(sp2)—I distances with a mean value of 210.1 pm and a large standard deviation of 6.1 pm. The values range from 205.7 to 223.9 pm. The mean values of this sample are very close to the typical bond distances listed by Allen and Coworkers172. Table 46 lists C(sp3)—I and C(sp2)—I bond distances for some selected crystal structures. 

Figure 2 Average NQR frequency difference of coordinated ortho-chlorine and noncoordinated (free) ortho-chlorine atoms in 2,6-dichlorophenolato(0,C/) complexes of metals, as a function of the excess M-Cl distance, defined as the average observed M-Cl distance minus the normal M-Cl single bond distance in octahedral complexes, from A. G. Orpen, L. Branner, F. H. Allen, O. Kennard, D. G. Watson, and R. Taylor, J. Chem. Soc., Dalton Trans. 1989, S1-S83...

Cyclization attendant by coupUng from molecules containing both an amino group and an allene unit has apparent utility in synthesis. Formation of five- or six-membered rings is subject to change of the substituent pattern of the allene moiety. The bond distance between the nitrogen atom and the unsaturation is of necessity important. Diazetidines have been acquired from 4-hydrazinyl-l,2-alkadienes. ... 

Bond distances acetic acid, 742 acetylene, 341—342, 343 alkyl hahdes, 129 allene, 377... 

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