Ac opper(I)-catalysed domino transformation for the synthesis of tricyclic imidazobenzimidazole derivatives was developed. Using readily available primary propargylic aminesa nd o-haloarylcarbodiimides as the starting materials,avariety of substituted benzo [d]imidazo[1,2-a]imidazoles was efficientlyand selectively assembled. Furtherinvestigations indicated that the domino reaction was likely the result of an ovel addition/cycloisomerisation/coupling process.

Reversible data hiding in encrypted image (RDHEI) is a technique that can provide the security and invisibility of their own information during the acquisition and sharing of them among multi-users. Among which, parametric binary tree labelling (PBTL) is a novel technique designed to serve for highcapacity RDHEI. However, considering the local smoothness of the image, its potential redundancy room has not been fully explored. In this paper, we propose an improved PBTL-RDHEI scheme (IPBTL-RDHEI in short). In IPBTL-RDHEI, an adjusting pixel modulation strategy is considered to reduce the probability of the overflow of pixels, making more embeddable pixels usage to carry secret data. Moreover, a blockwise rearrangement and compression (BRC) mechanism is introduced to decrease the length of the required auxiliary information. Experimental results confirm that the proposed scheme is able to achieve an average embedding rate as large as 1.827 bpp when the block size is set to 3×3. INDEX TERMS IPBTL-RDHEI, adjusting pixel modulation, block-wise rearrangement and compression (BRC), embedding rate.

Facile and Selective Synthesis of Imidazobenzimidazoles via a Copper-Catalyzed Domino Addition/Cycloisomerization/Coupling Process. -Using primary propargylic amines and o-haloarylcarbodiimides as starting materials, a variety of substituted benzo[d]imidazo[1,2-a]imidazoles is regioselectively assembled. This copper(I)-catalyzed domino transformation is likely the result of a novel addition/cycloisomerization/coupling process. -(XU, B.; PENG, B.; CAI, B.; WANG, S.; WANG, X.; LV*, X.; Adv. Synth. Catal. 358 (2016) 4, 653-660, http://dx.