623-70-1 Usage
Description
Ethyl crotonate, also known as Ethyl trans-2-butenoate, is a volatile flavor compound found in various fruits such as cashew apple, African star apple, naranjilla fruit, and sweet passion fruit. It is a colorless to pale yellow liquid with a boiling point of 136 °C and a flash point of 22 °C. Ethyl crotonate exhibits a strong acid coke and fruit aroma, with the incense of rum and ether.
Uses
Used in Flavor Industry:
Ethyl crotonate is used as a synthetic flavoring agent for fruit flavors in the flavor industry. It is applied in baked goods, beverages, and candy at concentrations of 2–7 ppm, providing a moderately stable, colorless to light yellow liquid with a sharp winey note.
Used in Solvent Applications:
Ethyl crotonate is used as a solvent for cellulose esters and a plasticizer for acrylic resins in the chemical industry. It serves as a solvent and softening agent in lacquers and organic synthesis.
Used in Organic Synthesis:
Ethyl crotonate is utilized as an intermediate in organic synthesis, contributing to the production of various chemicals and compounds.
Used in Paint Industry:
In the paint industry, ethyl crotonate is employed as a paint softener, enhancing the flexibility and workability of the paint.
Used as Allowable Food Spices:
Ethyl crotonate is recognized as an allowable food spice, mainly used for the preparation of fruit wine flavor, adding a unique aroma and taste to the final product.
Storage:
Ethyl crotonate should be stored in glass, tin, or resin-lined containers to maintain its stability and quality.
Production
It is obtained from the esterification of crotonic acid and ethanol in the presence of concentrated sulfuric acid.
Safety Profile
Moderately toxic by
ingestion and probably by inhalation. A skin ,
mucous membrane, and severe eye irritant.
Very dangerous fire hazard when exposed to
heat or flame; can react vigorously with
oxidizing materials. To fight fire, use foam,
CO2, or dry chemical. See also ESTERS.
When heated to decomposition it emits
acrid smoke and fumes.
Purification Methods
Wash it with aqueous 5% Na2CO3, then with saturated aqueous CaCl2, dry it with CaCl2 and distil it. [Beilstein 2 IV 1500.]
Check Digit Verification of cas no
The CAS Registry Mumber 623-70-1 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,2 and 3 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 623-70:
(5*6)+(4*2)+(3*3)+(2*7)+(1*0)=61
61 % 10 = 1
So 623-70-1 is a valid CAS Registry Number.
InChI:InChI=1/C6H10O2/c1-3-5-6(7)8-4-2/h3,5H,4H2,1-2H3/b5-3+
623-70-1Relevant articles and documents
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Shimamura et al.
, p. 221 (1954)
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Fabrication of Ni3N nanorods anchored on N-doped carbon for selective semi-hydrogenation of alkynes
Shi, Xiaozhen,Wen, Xin,Nie, Shilin,Dong, Jie,Li, Jingde,Shi, Yongqing,Zhang, Huiling,Bai, Guoyi
, p. 22 - 30 (2019/12/26)
Nickel is a highly active catalyst for the semi-hydrogenation of alkynes. However, the low selectivity of the alkene product caused by the over-hydrogenation reaction on Ni has hindered its practical applications. In this work, we report a new nickel nitride (Ni3N)-catalyzed semi-hydrogenation of alkynes to the corresponding alkenes. The Ni3N nanorods were facilely fabricated via a direct pyrolysis of the solid mixture of nickel acetate tetrahydrate and melamine (Mlm). The Ni3N phase in the optimum catalyst (Ni3N/NC-6/5-550) is shown to be effective and stable in the semi-hydrogenation of alkynes, with a high yield and good selectivity for alkenes (Z/E ratios up to >99/1). Both terminal and internal alkynes bearing a broad scope of functional groups are readily converted into alkenes with good chemo- and stereoselectivity. Notably, it was found that the over-hydrogenation can be markedly suppressed even at high conversion of alkyne. Density functional theory (DFT) calculations reveal that the low interaction between the alkene product and the Ni3N might plays a critical role in the selectivity enhancement.
MONOMER, POLYMER, RESIST COMPOSITION, AND PATTERNING PROCESS
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, (2014/03/21)
A polymer comprising recurring units derived from a (meth)acrylate monomer of tertiary ester type having branched alkyl on alicycle is used to form a resist composition. When subjected to exposure, PEB and organic solvent development, the resist composition is improved in dissolution contrast.