Thiadiaziridine 1,1-dioxides: synthesis and chemistry

Azoalkanes: A Novel Class of Additives for Cross‐Linking and Controlled Degradation of Polyolefins

“…Instead they find wide applications as dyes. In order to determine how structural variations of azoalkanes affect their vis-breaking efficiency a series of symmetrical (1-7), unsymmetrical azoalkanes (8)(9)(10)(11)(12)(13)(14)(15), as well as corresponding hydrazone and azine compounds (16)(17)(18) were synthesized as shown in Figure 1.…”

“…Compounds 1 and 7 were synthesized according to the procedure of Timberlake et al [10] Compounds 3, [11] 9, [12] 13, [13] 16, [14] 17 [15] and 18 [16] were prepared according to methods reported in the literature. DSC analysis was performed on a Q1000 instrument from TA Instruments under a nitrogen atmosphere at a heating rate of 10 8C Á min À1 using sealed pressure capsules.…”

A Palladium‐Catalyzed Dehydrogenative Diamination of Terminal Olefins

“…[11] Over a period of 30 min, N,N-di-tert-butyl sulfamide (10.0 g, 48.0 mmol) was added to a suspension of sodium hydride (60 %; 2.0 g, 50.0 mmol) in hexanes (400 mL). The resulting slurry was stirred at reflux under argon for 2 h. Upon cooling to À30 8C, tertbutyl hypochlorite (5.43 g, 50.0 mmol) was added dropwise to the slurry while exposure to direct light was avoided.…”

“…This reaction is likely to proceed via a diene species which is formed in situ. [10] However, when N,N-di-tert-butylthiadiaziridine 1,1-dioxide (4) [11,12] is used as the nitrogen source along with the Pd catalyst, then terminal olefins are regioselectively diaminated at the terminal carbon position to form 5 via a different reaction mechanism to that already reported (Scheme 2). Herein, we report our preliminary results on this subject.…”

Photoinduced electron transfer C—C bond cleavage reactions; oxidations and isomerizations

“…The substituted bibenzyl l a was prepared from 4-methoxybenzyl bromide (47) Preparation of 2,3-dimethyl-2,3-diphenylbutane (1 e) To a mixture of 6.8 g of sodium hydroxide, 100 mL of bleach, and 5 drops of the phase transfer agent Aliquot 336 in 100 mL of hexane was added 2.0 g (6.00 mmol) of N,N1-bis(1-methyl-1-phenylethy1)sulfamide (51). The mixture was allowed to stir at room temperature for a period of 72 h. The resulting hexane solution was washed in turn with water, 5 % hydrochloric acid, 5% sodium bicarbonate, and finally water, and then dried over magnesium sulfate.…”