Yu-Lu Wang

Two-Phase Dehydrogenation of Aryl Substituted Carbazide Compounds

Abstract Two-phase dehydrogenation, which is a new reaction of aryl substituted carbazide compounds, is described in this paper. Ten new azo compounds were synthesized by the reaction of aryl substituted carbazide compounds with a phenoxyl radical between two phases in good yields.

A NEW AND EFFICIENT SOLID STATE SYNTHESIS OF DIARYL THIOUREAS

Fourteen diaryl thioureas which are physiologically active have been synthesized in the solid state at room temperature. The reaction needs only simple equipment and gives excellent yields.

The Application of Ceric Ammonium Nitrate in the Synthesis of Carbodiazones

Abstract The preparation of bisaryl carbodiazone compounds from the aryl substituted carbazides with Ceric Ammonium Nitrate (CAN) has been reported for the first time in excellent yields (80-91%). This method only needs simple instruments and short reaction time. A possible mechanism has been suggested.

SOLID STATE SELECTIVE SYNTHESIS OF DIARYL CARBAZONE

The selective synthesis of diaryl carbazone using K3Fe(CN)6 as oxidant under alkaline condition in solid state is reported for the first time. Eight diaryl carbazone have been synthesized in excellent yields, and this method only needs cheap reagents, and simple procedure under mild condition.

A green route to the synthesis of azo compounds

Polyethylene glycol (PEG, average molecular weight 400) was used as an absorbent for NO2, the absorptivity was found to reach up to 97%. PEG·NO2, the resulting absorbent product, proved to be a very efficient, clean and moderate oxidant, It can convert hydrazo derivatives 1 to the corresponding azo compounds 2 for the first time. The spent PEG can be recovered and recycled after the oxidation process.

A Facile and Efficient Synthesis of Aryl Toluenesulfonhydrazides and Aryl Toluenesulfonates under Solvent-free Conditions

A rapid, efficient method is described for synthesis of aryl toluenesulfonhydrazides from toluene-sulfonyl chloride and substituted phenylhydrazines and for the synthesis of aryl toluenesulfonates from toluenesulfonyl chloride and substituted phenols. The procedure is simple, environmentally benign and occurs in good yields.

A SIMPLE, EFFICIENT, AND NEW CATALYST OXIDATION METHOD WITH KClO3/H2SO4/FeSO4 FOR PREPARING BISAZO COMPOUNDS

Using potassium chlorate, sulfuric acid and ferrous sulfate as a catalytic oxidation system to oxidize the aryl substituted carbazide to prepare new type bisazo compounds in one phase have been described for the first time in this paper. Eight bisaryl carbodiazones have been synthesized in high yields under mild conditions. A possible mechanism has been suggested.

AN EFFICIENT AND CONVENIENT PROCEDURE FOR PREPARATION OF DIARYL CARBAZONE FROM ARYL SUBSTITUTED CARBAZIDE

Abstract A new facile method for the synthesis of diaryl carbazone (ArN=NCONHNHAr) from aryl substituted carbazide is described. Eight of the compounds were preparated by oxidation of aryl substituted carbazide with ferric chloride in acid medium at room tempreture in good yield.

SYNTHESIS OF NEW-TYPED α,β-UNSATURATED ACYL AZO COMPOUNDS WITH NaBrO3/H2SO4 AS THE OXIDATIVE SYSTEM

ABSTRACT Eight new-typed α,β-unsaturated acyl azo compounds were prepared for the first time using NaBrO3/H2SO4 as the oxidant with simple stirring apparatus at room temperature. NaBrO3 was first reported as an efficient dehydrogenating agent in this paper.

AN EFFICIENT SOLID-STATE METHOD FOR THE PREPARATION OF ACYL THIOSEMICARBAZIDES

Solid-state syntheses of acyl thiosemicarbazides are reported for the first time. Eleven acyl thiosemicarbazides have been synthesized at room temperature in excellent yields (84.5 ∼ 91.0%). Among them, eight compounds 3a, 3d, 3e, 3g–k are new. The reaction proves to be extremely simple and highly efficient (in 6 ∼ 18 min).