BIS DIIMIDES

Stable achiral syn and anti atropisomeric forms were obtained in bis diimides 406. 

The r-electron deficient bis(diimide) motif of 7—in its folded conformation—was found to bind an electronic complementary pyrene end-group of the polysiloxane 8 to form a 7r-7r-stacked complex. Studies of the resulting blend by environmental scanning electron microscopy (ESEM) showed it to be both homogeneous and readily healable at temperatures above 80 °C, though its mechanical properties were relatively poor. 

Figure 13 Minimized model (molecular mechanics) for complementary 7T-7T-stacking between a pyrenyl end-group and a bis(diimide) chain-fold. (Reproduced with permission from Ref. 30. Elsevier, 2008.)...

Aliphatic—aromatic poly(amide—imides) based on N,1S7-bis(carboxyalkyl)-benzophenone-3,3, 4,4 -tetracarboxyhc diimides have shown a 10% weight loss at 400°C (14). 

N,N - Bis(trimethylsilyl)sulfur(rV) diimide Me3SiN=S=NSiMc3 is an especially versatile source of the N=S=N functionality in the formation of both acyclic and cyclic S-N compounds. It is conveniently prepared by the reaction of NaN(SiMc3)2 and thionyl chloride (Eq. 2.5). 

A redox process also occurs in the reaction of selenium diimides with bis(amino)stannylenes. Eor example, the cyclic stannylene McaSi)//-N Bu)2Su reacts in a 1 1 molar ratio with BuN=Sc=N Bu to give a spirocyclic tin complex, which reacts with a second equivalent of the stannylene to generate a Sn-Sn bond [d(Sn-Sn) = 2.85 A, /( Sn- Sn) = 13,865 Hz)] (Scheme 10.6). ... 

Scheme 10.6 Reaction of a selenium diimide with a bis(amino)stannylene...

Perylenes (70) are diimides of perylene-3,4,9,10-tetracarboxylic acid, and may be prepared by reaction of the bis-anhydride of this acid, 89 (1 mol) with the appropriate amine (2 mol) in a high-boiling solvent as illustrated in Scheme 4.11. The synthesis of perinones 71 and 72 involves condensation of naphthalene-1,4,5,8-tetracarboxylic acid with benzene-1,2-diamine in refluxing acetic acid. This affords a mixture of the two isomers, which may be separated by a variety of methods, generally involving their differential solubility in acids and alkalis. 

Scheme 8 Naphthalene diimide (18), pyrazinonaphthalimide (19), and bis pyrazino-naphthalimide derivatives (20, 21).

Other, rigid-rod monomers can be incorporated into PET, to increase chain stiffness, and therefore the Tg (Figure 6.5). A prime example of such a rigid copolyester is a multi-ring poly(ethylene terephthalate-imide) [43], As was the case with the polyesteramides of Gaymans, the imide-containing diol monomer, A,A-bis[p-(2-hydroxyethoxycarbonyl)phenyl]-biphenyl-3,3,4,4-tetracarboxy-diimide, was preformed prior to polycondensation, where this monomer is free... 

Thiadiazole oxides and reduced forms are readily prepared via [4 -h 1] cyclizations (Table 4). The reagents employed for this purpose are thionyl chloride, sulfuryl chloride, sulfur tetrafluoride, N,N -bis(p-toluenesulfonyl)sulfur diimide, cyclic diimides, pentafluoroethyliminosulfur difluoride and sulfamide. 

Die photochemische Umsetzung von 2,3-Diphenyl-2H-azirin mit Bis-[2-methyl-phenyl]-carbo-diimid fiihrt zu 2,4-Diphenyl-5-(2-methyl-anilino)-l-(2-methyl-phenylj-imidazot441. 

Heistcllung und Anwendung von N,N -Bis-[mcthoxycarhonyl]-sulfurdiimid sind fur das Beispicl von dessen Reaktion mit 2-Methyl-2-buten zu N-(2-Methyl-2-butenyl)-carbamidsaure-methylester (43-52%, bezogen auf die Vorstufe des Diimids) ausfiihrlich beschrieben1 Hydrolyse des Esters ergibt dann J-Amino-2-methyl-2-buten. 

The unsaturated four-membered P2N2 ring is also stabilised by the formation of diadducts with Lewis acids, which are surprisingly formed in the reaction of Ph2PCl with bis(trimethylsilyl)sulfur diimide with Gads or AICI3 [eqn... 

N N -Bis(methoxycarbonyl)sulfur diimide Sulfur diimide, dicarboxy-, dimethyl ester (16762-82-6), 65, 159... 

The intercalation of polycyclic aromatic compounds into duplex DNA structures was used to develop nucleic acid-based electrochemical sensors.66 For example, the bis-ferrocene-tethered naphthalene diimide (16) was used as a redox-active intercalator to probe DNA hybridization.67 The thiolated probe was assembled on a Au electrode, and the formation of the duplex DNA with the complementary analyte nucleic acid was probed by the intercalation of (16) into the double-stranded nucleic acid structure and by following the voltammetric response of the ferrocene units (Fig. 12.17a). The method enabled the analysis of the target DNA with a sensitivity that corresponded to ca. 1 x 10-20mol. 

Reaction of 2-aminobenzamides with A, A( -bis(p-toluenesulfonyl)sulfur-diimide (Tos—N=S —N —Tos) gives betaines 278 via the acyclic intermediates 280. Compound 278 (R = R = H) is a yellow crystalline solid (Vco 1640 cm ) which is hydrolyzed to compound 281. Meerwein alkylation gives benzothiadiazinium tetrafluoroborates 282. ° ° ... 

Azoxyleiie Azoaimefhyl benzene or Tefra-methylazobenzene (called Bis-[dimethyl-phenyll-diimid Tetrameth.yl. zobenzoJ or Azoxylol in Get), (HjC)a-CsHj-N N-C6Ha--(CHj)a, mw 238.32, N 11.76%. Five isomers are listed in the literature 4,4 -azo-o-xyIene or 3,4,3 4 -Tetramethyl-azobenzene (Ref 1) 4,4 -azo-m-xylene or Z S -tetramethyl-azobenzene (Ref 2) 4,5 azo-m-xylene or... 

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