[EN] BIPHENYL COMPOUND AS IMMUNOMODULATOR, PREPARATION METHOD THEREFOR AND USE THEREOF [FR] COMPOSÉ BIPHÉNYLE UTILE EN TANT QU'IMMUNOMODULATEUR, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION [ZH] 作为免疫调节剂的联苯类化合物及其制备方法和应用
[EN] BIPHENYL COMPOUND AS IMMUNOMODULATOR, PREPARATION METHOD THEREFOR AND USE THEREOF [FR] COMPOSÉ BIPHÉNYLE UTILE EN TANT QU'IMMUNOMODULATEUR, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION [ZH] 作为免疫调节剂的联苯类化合物及其制备方法和应用
Silver-catalyzed deuteration of nitroaromatics has been achieved using D2O as the deuterium source. Distinct from the well-established directing group-guided hydrogen-isotope exchange, this protocol showed an interesting deuteration pattern, where considerable deuterium accumulation was observed around the aromatic rings. Controlling experiments suggested that the deuteration was initiated by a silver-promoted
[EN] BIPHENYL COMPOUND AS IMMUNOMODULATOR, PREPARATION METHOD THEREFOR AND USE THEREOF<br/>[FR] COMPOSÉ BIPHÉNYLE UTILE EN TANT QU'IMMUNOMODULATEUR, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION<br/>[ZH] 作为免疫调节剂的联苯类化合物及其制备方法和应用
Skeletal rearrangements on chemical ionization of dibenzyl ether and derivatives
作者:Eric E. Kingston、James S. Shannon、Vladimir Diakiw、Michael J. Lacey
DOI:10.1002/oms.1210161003
日期:1981.10
AbstractProtonated molecular ions of dibenzyl ether, formed by chemical ionization using hydrogen and isobutane as reagent gases, undergo skeletal rearrangements to lose water and formaldehyde, both in the ion source and the flight path. The rearrangements have been elucidated by deuterium labelling and chemical substitution. The water lost contains the reagent proton and an aromatic hydrogen atom, and the aromatic hydrogen atoms have been shown to be mobile prior to the reaction. It is proposed that the skeletal rearrangement for water loss is initiated by protonation on the ether oxygen atom, followed by benzyl migration. The formaldehyde lost contains benzylic hydrogen atoms exclusively, and it is proposed that the skeletal rearrangement is preceded by hydrogen rearrangement of an oxygen protonated molecular ion to a ring protonated molecular ion. Daughter ion structures are supported by comparisons of their collision induced dissociation spectra with those of isomeric ions prepared by alternative routes.