CAS No.15679-19-3,Thiazole,2-ethoxy- Suppliers,MSDS download

Detail of "15679-19-3"

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CAS Number:

15679-19-3

Name:

Thiazole,2-ethoxy-

Superlist Name:

2-Ethoxythiazole

Molecular Structure:

Formula:

C₅H₇NOS

Molecular Weight:

129.18

EINECS:

239-760-5

Density:

1.146 g/cm³

Boiling Point:

167.9 °C at 760 mmHg

Flash Point:

55.3 °C

Appearance:

Colorless to light yellow liquid

Hazard Symbols:

Risk Codes:

10-36/37/38

Safety:

16-26 Details

Transport Information:

UN 1993 3/PG 3

Reference

The mechanism of thermal eliminations: The mechanism of thermal eliminations. Part 21. Rate data for pyrolysis of 2-ethoxyquinoline, 1- and 3-ethoxyisoquinoline, and 2-ethoxythiazole: correlation of reactivities with p-bond order of the C:N bond. Al-Awadi, Nouria; Taylor, Roger (Fac. Sci., Univ. Kuwait, Kuwait). J. Chem. Soc., Perkin Trans. 2, (10), 1589-92 (English) 1986. CODEN: JCPKBH. ISSN: 0300-9580. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) The rates of thermal elimination of ethylene from the title compds. were measured between 587.3 and 722.9 K. The reactivities relative to 2-ethoxypyridine at 650 K are: 3-ethoxyisoquinoline (0.21), 2-ethoxyquinoline (3:13), 1-ethoxyisoquinoline (6.47), 2-ethoxythiazole (63.1). These reactivities parallel the p-bond order of the C:N bond, though the exceptional reactivity of 2-ethoxythiazole is attributed to addnl. acceleration through +M electron release from sulfur to nitrogen. This emphasizes the greater relative importance of nucleophilic attack by the nitrogen upon the b-hydrogen atom as compared with the analogous mechanism for pyrolysis of esters. Because of the semi-concerted nature of the reaction, interruption of aromaticity is much less significant than in, for example, electrophilic arom. substitution. Thus retention of the benzenoid character of the ring not involved in the elimination is not an important rate-detg. feature, as shown by the lower reactivity of 3-ethoxyisoquinoline relative to 2-ethoxypyridine. The unimportance of the interruption of aromaticity of the benzenoid ring means that conjugative effects are better relayed to nitrogen in the b-naphthalene-like position (isoquinoline) than in the a-naphthalene-like position (quinoline). This is the reverse of the familiar pattern for reactions of naphthalene-like systems where full charges are involved, and may be an addnl. 66728-96-9 and 15679-19-3 are just another two chemicals used in this study. factor contributing to the higher reactivity of 1-ethoxyisoquinoline than of 2-ethoxyquinoline, as may also be the -I effect of the benzo substituent. The conclusions are used to predict elimination rates for alkoxyheterocycles not yet studied. .

Detail of "15679-19-3"

Thiazole,2-ethoxy-

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Reference