Determination of CS Alkylbenzene' D. E. NICHOLSON and 5. Baytown, Tex.
H. HASTINGS,
Humble Oil 8 Refining Co.,
CS-116 Imfrumenf: Perkin-Elmer Model I 12, CrBr prism Sample Phose: Solution in corbon tetrachloride
Concn, compooent
Cell Windows; CrBr Absorbance Meosuremenf: Calculofion: 0-Propyibenzene
CeHll 10-100
1.3.5-Trimethyl-
CeHlz
10.5
20.42s
0.362
1 0.100
~ _ _ _ _ _ _ _ _ _ _ _ ~ _ _ _ ~benzene_
0-100
_
_
1.2.4-Trimethylbenzene
187.
_
CoHt2
f0.5
~
0-100
CeHlp
benzene
_
P o i n f L
0.100
benzene
1-Methyl?-ethyl-
Bare line-
0-100
19.36~ 0.321
_
iO.5
_
_
~
31.15~ 1.407
~
1 0.100
I"
_
i""el.e matri GraphicalAndy
Relative AI
Componenf/X
m.odp
20.42~
1
1.631 n.nfii
0.100
_
1
_
?
I""
_
1.203
19.36~ 0.475 n.nxo
31.15~ 0.029 n.nz4
22.77~
0.034
n nAx
~
j=O,
Diphenylsilanediol
D. J. NEAL and R. D. BLAUMANIS Research Laborotory, linde Co., Division of Union Corbrde Corp., Tonowando, N. Y.
OH
I
CnHh-Si-GH.
bH Stmcturai r ormula of Diphenylsilanediol
D
is soluble in acetone, ethyl ether, ethyl alcohol, and dimethylformamide. It is nearly insoluble in rater, xylene, toluene, n-heptane, benzene, and carbon tetrachloride. It crystallizes from ethIPHENYLSILANEDIOL
anol in lathlike crystals (Figure 1). It melts with decomposition a t 13741" C.
Indicated Crystal System. Monoclinic.
OPTICALPROPERTIES Refractive indices (daylight filter) :
a = 1.564 f 0.004; p = 1.648 =t0.004; y = 1.656 1 0.004.
Optic Axial Angle. 2V = 43". Optic Axial Plane. 100. Sign of Double Refraction. Negative. Extinction, p A a = 12"; o( A c = 110. Color. Colorless.
ACKNOWLEDGMENT
The diphenylsilanediol described was prepared by the Silicones Division of Union Carbide Corp. CONTRIBUTIONG of crysta4lopraphic data for this section should be sent t o Walter C. McCrone, 501 East 32nd St,, Chicago 16, Iii.
Drincipal Lines in X-Roy Spectrum d , A.
4.40 4.25 4.00
3.85 3.70 3.55 3.45 3.38 3.20 Figure 1. Typicol crystals of diphenylsilonedial obtained from ethyl alcohol
l/Io 8 6 5 7 4 3 6 2 3
d, A.
l/Io
d, A.
3.10 3.05 2.95 2.77 2.75 2.70 2.63 2.46 2.42
3
2.36 2.30 2.22 2.13 2.06 2.02 1.97 1.93 1.80
4 4 2
2 3 '
1 1 3
1.69
1.62 1.59 1.56
1/10 3
a
1 R 1
1 2 1
2
2 1
1
1
VOL. 32, NO. 1, JANUARY 1960
139
