self-condensationn.

Brit.

/ˌsɛlfˌkɒndɛnˈseɪʃn/,

/ˌsɛlfˌkɒnd(ə)nˈseɪʃn/, U.S.

/ˌsɛlfˌkɑndənˈseɪʃən/

Origin: Formed within English, by derivation. Etymons: self- prefix, condensation n.

Etymology: < self- prefix + condensation n. Compare later self-condense v.With sense 2 compare German Selbstkondensation (1875 or earlier as Selbstcondensation).

†1. The concentration of one's thoughts. Obsolete. rare.

ΘΚΠ

the mind > attention and judgement > attention > earnest attention, concentration > [noun]

intendance1390

intentionc1400

intensiona1619

absorption1640

immersion1647

preoccupation1788

concentration1823

engrossment1838

self-condensation1841

enchainment1849

submergence1872

immersal1901

absorbency1974

1841 Musical World 22 Apr. 264 This [music is]..the emanation of a mind fertilized by the long habitude of internal reflection and self-condensation.

1847 T. Medwin Life Shelley I. 309 It must have required a rare power of self-condensation and abstraction, to have enabled him to write under the different afflictions that beset him.

2. Chemistry. A reaction in which molecules of the same compound become bonded together. In later use spec.: a reaction in which two identical molecules react to form a larger molecule together with elimination of a small molecule such as water. See condensation n. 6.

ΘΚΠ

the world > matter > chemistry > organic chemistry > chemical processes or reactions > [noun] > condensation > types of

self-condensation1879

polycondensation1936

Prins reaction1944

1879 O. Richter in Chem. News 1 Aug. 52/1 In my opinion the law of multivalence is the outward manifestation of a powerful tendency inherent in all chemically simple bodies to undergo the process of self-condensation, in virtue of which two or more univalent molecules, 2E2, may by a species of physical impact become cemented together in such a way as to give rise to a series of progressively, more complex, and specifically heavier molecules.

1905 Jrnl. Chem. Soc.: Trans. 87 1027 Contrary to our experience in distilling mixtures of tetramethyl glucose and its methylglucosides, in the present case the glucosidic portion was in the less volatile part of the product, a result to be expected on the assumption that self-condensation of the sugar had occurred.

1946 Nature 12 Oct. 514/1 The highly reactive bifunctional compound, γ-bromopropylamine,..would immediately undergo self-condensation.

1964 N. G. Clark Mod. Org. Chem. xxiii. 478 The self-condensation of acetophenone provides one of the rare examples of the carbonyl group of an aromatic ketone participating in a condensation reaction.

2011 M. B. Smith Org. Chem. xxii. 1131 Self-condensation is also possible with symmetrical ketones such as 3-pentanone.

This entry has been updated (OED Third Edition, January 2018; most recently modified version published online June 2022).

单词	self-condensation
释义	self-condensationn. Brit. /ˌsɛlfˌkɒndɛnˈseɪʃn/, /ˌsɛlfˌkɒnd(ə)nˈseɪʃn/, U.S. /ˌsɛlfˌkɑndənˈseɪʃən/ Origin: Formed within English, by derivation. Etymons: self- prefix, condensation n. Etymology: < self- prefix + condensation n. Compare later self-condense v.With sense 2 compare German Selbstkondensation (1875 or earlier as Selbstcondensation). †1. The concentration of one's thoughts. Obsolete. rare. ΘΚΠ the mind > attention and judgement > attention > earnest attention, concentration > [noun] intendance1390 intentionc1400 intensiona1619 absorption1640 immersion1647 preoccupation1788 concentration1823 engrossment1838 self-condensation1841 enchainment1849 submergence1872 immersal1901 absorbency1974 1841 Musical World 22 Apr. 264 This [music is]..the emanation of a mind fertilized by the long habitude of internal reflection and self-condensation. 1847 T. Medwin Life Shelley I. 309 It must have required a rare power of self-condensation and abstraction, to have enabled him to write under the different afflictions that beset him. 2. Chemistry. A reaction in which molecules of the same compound become bonded together. In later use spec.: a reaction in which two identical molecules react to form a larger molecule together with elimination of a small molecule such as water. See condensation n. 6. ΘΚΠ the world > matter > chemistry > organic chemistry > chemical processes or reactions > [noun] > condensation > types of self-condensation1879 polycondensation1936 Prins reaction1944 1879 O. Richter in Chem. News 1 Aug. 52/1 In my opinion the law of multivalence is the outward manifestation of a powerful tendency inherent in all chemically simple bodies to undergo the process of self-condensation, in virtue of which two or more univalent molecules, 2E2, may by a species of physical impact become cemented together in such a way as to give rise to a series of progressively, more complex, and specifically heavier molecules. 1905 Jrnl. Chem. Soc.: Trans. 87 1027 Contrary to our experience in distilling mixtures of tetramethyl glucose and its methylglucosides, in the present case the glucosidic portion was in the less volatile part of the product, a result to be expected on the assumption that self-condensation of the sugar had occurred. 1946 Nature 12 Oct. 514/1 The highly reactive bifunctional compound, γ-bromopropylamine,..would immediately undergo self-condensation. 1964 N. G. Clark Mod. Org. Chem. xxiii. 478 The self-condensation of acetophenone provides one of the rare examples of the carbonyl group of an aromatic ketone participating in a condensation reaction. 2011 M. B. Smith Org. Chem. xxii. 1131 Self-condensation is also possible with symmetrical ketones such as 3-pentanone. This entry has been updated (OED Third Edition, January 2018; most recently modified version published online June 2022). < n.1841
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