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P-톨루엔설폰 산

P-톨루엔설폰 산
P-톨루엔설폰 산 구조식 이미지
카스 번호:
104-15-4
한글명:
P-톨루엔설폰 산
동의어(한글):
P-톨루엔설폰산;P-톨루엔설폰산;톨루엔설포닉애씨드
상품명:
p-Toluenesulfonic acid
동의어(영문):
TsOH;TL65;PTSA;TSA-95;TL65LS;Tsa-hp;Tsa-mh;TSA-65W;TSA-65M;Eltesol
CBNumber:
CB1771154
분자식:
C7H8O3S
포뮬러 무게:
172.2
MOL 파일:
104-15-4.mol

P-톨루엔설폰 산 속성

녹는점
106~107℃
끓는 점
116 °C
밀도
1.07
굴절률
1.3825-1.3845
인화점
41 °C
저장 조건
Flammables area
물리적 상태
Solution
색상
Clear colorless to light yellow
수용성
soluble
CAS 데이터베이스
104-15-4(CAS DataBase Reference)
NIST
P-toluene sulfonic acid(104-15-4)
EPA
Benzenesulfonic acid, 4-methyl-(104-15-4)

안전

위험품 표기 C
위험 카페고리 넘버 34-10
안전지침서 45-26-23
유엔번호(UN No.) 2585
위험 등급 8
포장분류 III
HS 번호 29163990
유해 물질 데이터 104-15-4(Hazardous Substances Data)

P-톨루엔설폰 산 MSDS


4-Methylbenzenesulfonic acid

P-톨루엔설폰 산 C화학적 특성, 용도, 생산

개요

p-Toluene sulfonic acid (PTSA) or tosylic acid (TsOH) is an organic compound with the formula CH3C6H4SO3H. It is a white solid that is soluble in water, alcohols, and other polar organic solvents. The 4-CH3C6H4SO2- group is known as tosyl group and is often abbreviated as Ts or Tos. Most often, TsOH refers to the monohydrate, TsOH.H2O.
TsOH is a strong organic acid, about a million times stronger than benzoic acid. It is one of the few strong acids that is solid and, hence, conveniently weighed. Also, unlike some strong mineral acids (especially nitric acid, sulfuric acid, and per chloric acid), TsOH is non - oxidizing.

화학적 성질

Clear colorless to light yellow solution

정의

ChEBI: An arenesulfonic acid that is benzenesulfonic acid in which the hydrogen at position 4 is replaced by a methyl group.

화학 반응

p-Toluene sulfonic acid may be converted to p-toluene sulfonic anhydride by heating with phosphorus pentoxide.
When TsOH is heated with acid and water, a hydrolysis reaction takes place and toluene is formed:
CH3C6H4SO3H + H2O → C6H5CH3 + H2SO4
This reaction is general for aryl sulfonic acids, but the rate at which it occurs depends upon the structure of the acid, the temperature and the nature of the catalyzing acid. For example p- TsOH is unaffected by cold concentrated hydrochloric acid, but hydrolyzes when heated to 186°C in concentrated phosphoric acid.

Preparation and handling

TsOH is prepared on an industrial scale by the sulfonation of toluene. It hydrates readily. Common impurities include benzene sulfonic acid and sulfuric acid. Impurities can be removed by recrystallization from its concentrated aqueous solution followed by azeotropic drying with toluene.
Toluene sulfonic acid finds use in organic synthesis as an "organic - soluble" acid catalyst. Examples of uses :
Acetalization of an aldehyde.
Esterification of carboxylic acids.
Trans esterification of an ester.

Tosylate esters

Tosylate esters are used as alkylating agents because the tosyl group is electron-with drawing, which makes the tosylate anion a good leaving group. The tosyl group is also a protecting group for alcohols and amines, prepared by combining the alcohol with 4- toluenesulfonyl chloride, usually in an aprotic solvent, often pyridine, the basicity of which activates the reaction. Toluenesulfonate esters undergo nucleophilic attack or elimination. Reduction of tosylate esters gives the hydrocarbon. Thus, tosylation followed by reduction allows for the deoxygenation of alcohols.

P-톨루엔설폰 산 준비 용품 및 원자재

원자재

준비 용품


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