The System Sulfur Dioxide-Acetic Acid - ACS Publications - American


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NOTES

May, 1944 zaldi-morpholine, prepared according to M. Zief and J. P. Mason,2 were condensed with a variety of alkyl bromides, such as n-butyl, nheptyl, n-octyl, tetradecyl and hexadecyl bromides, to yield the corresponding symmetrical di-morpholinium di-bromides possessing the following structures CHzCHz

CHzCHt

++

[ . < C H z C H ~ - cRH z - ~ < , , R ,CHz~]

r

L

R

Brz-

CRH~

1

R

J

R : n-CaHp-, n-CrHis-, V L - C ~ H In-Ci,HZp-, I-, n-CisH3.v

841

The melting points were determined by means of a chromelalumel thermocouple and were accurate to well within 0.1O Melting points rather than freezing points were measured since the mixtures were found to supercool to a marked degree. f

.

TABLE I MELTING POINTDATAOF THE SYSTEM SULFUR DIOXIDBACETIC ACID Mole % So1

M.p,, 'C.

Mole % SO,

M. p,, "C.

0.0 7.7 9.6 13.1 18.0 a4.7

16.6 11.5 8.3 -44.1 -44.2 -41.9

33.5 46.4 59.6 63.3 78.3 100.0

-40.4 -38.0 -38.7 -39.2 -75.6 -72.7

Procedure To 0.01 mole of methylene- or benzal-di-morpholinewas added 0.02 mole of the respective alkyl bromide and 11 ml. of 95y0 ethyl alcohol. The mixture was then gently refluxed for four hours. The reaction material when solid, or otherwise after removal of the alcohol by evaporation under reduced pressure, was crystallized from ethyl acetate; yields, Kb70OJo.

The observations are collected in Table I and are represented graphically in Fig. 1.

20 O

16.6 O

TABLEI M. p., "C. Analyses, % N Compounds Formulas (uncor.) Calcd. Found 4,4'-Methylenedimoryholiniumdi-bromides 4,4'-Di-n-butyl 4,4'-Di-n-heptyl 4,4'-Di-n-octyl 4,4'-Di-tetradecyl 4,4'-Di-hexadecyl

CivHaNaOaBrr CnHuNzOaBrr CuHtrNsOaBrr CnHnN:OlBrs ChHuNrOlBrz

144 (dec.) 141 (dec.) 143 (dec.) 165 (dec.) 180 (dec.)

6.08 5,14 4.89 3.78 3.52

3"

6.22 5.17 4.95 3.90 3.31

v

-20"

C:8HmNaO:Br: CaHmNzOlBrr CaHuNsaBrr C!aHsNtOzBra CrrHslNzOzBr:

174 153 156 175 178

5.22 4.51 4.32 3.43 3.21

5.34 4.63 4.39 3.72 3.10

-38.0'

-40"

-46.1'

(2) M. Zief and J. P. Mason, J . Org. Chsm., 8, 1 (1943).

THECHEMICAL LABORATORIES OF NEWYORK UNIVERSITY, WASHINGTON &KJARE COLLEGE, NEWYORKCITY,N. Y., AND OF ST.PETER'SCOLLEGE, JERSEYCITY,N. J. RECEIVED NOVEMBER 29, 1943

BY W. H. SCHEUB AND C. R. MCCROSKY

la

-60' -72.7" -80.3'

I

0

The System Sulfur Dioxide-Acetic Acid

3 g ifr

4,4'-Benzaldimorpholinium di-bromides 4,4'-Di-n-butyl 4,4'-Di-n-heptyl 4,4'-Di-noctyl 4,4'-Di-tetradecyl 4,4'-Di-hdxadecyl

3

20

-80"

.

40 60 Mole % SOZ. Fig. 1.

80

100

I t can be seen that the melting point curve To find out whether a definite compound of sul- shows a maximum at 50 mole yo sulfur dioxide fur dioxide and acetic acid exists, the melting and a temperature of -38'. The indicated compoints of a series of mixtures of these two sub- pound, HSOZC~H~OZ, solidifies in the form of stances have been measured. thin, colorless flakes which show a tendency to The acetic acid was dehydrated by successive sublime. The lower eutectic was established by a treatments of glacial acetic acid with triacetyl definite melting Boint at - 80.3' ; the upper euborate and 20% oleum. In each treatment the tectic a t -46.1 was derived by extrapolation. mixture was first reiiuxed and then fractionally These eutectic mixtures contained, respectively, distilled. The mixtures were DreDared bv dissolv- 78.4 and 13.2 mole % of sulfur dioxide. ing previously dried sulfw dioxide in &e anhy- DEPARTMENT OF CHEMISTRY drous acetic acid and were then frozen in a bath of UNIVERSITY solid carbon dioxide and acetone, or of liquid air. SYRACUSE, NEW YORK RECEIVEDFEBRUARY 10, 1944