Elegant process for synthesis of 3-(7H-dibenzo[c,h]xanthen-7-yl)benzaldehyde (3), as new starting material to create a set of novel xanthene analogues, 2-(3-(7H-dibenzo[c,h]xanthen-7-yl)benzylidene)malononitrile (4), 3-(3-(7H-dibenzo[c,h]xanthen-7-yl)phenyl)-2-cyanoacrylic acid (5), and Ethyl-3-(3-(7H-dibenzo[c,h]xanthen-7-yl)phenyl)-2-cyanoacrylate (6), was achieved starting with available materials under mild conditions. Various concentrations (ca. 0.1–1.0 mM) of the synthesized cyano-benzylidene xanthene derivatives, namely compounds 3–6, were tested as inhibitors to control copper corrosion in alkaline solutions employing polarization and electrochemical impedance spectroscopy (EIS) measurements. Results revealed that the four studied xanthenes derivatives served as efficient (mixed-type) inhibitors. The inhibition efficiency increased with increase in inhibitor concentration.The inhibition performance of studied compounds varied according to their chemical structures. The best inhibitor, compound (5), achieved a maximum inhibition efficiency of 98.7% (calculated from corrosion current densities) and ~ 95% (estimated from charge-transfer resistance values) at a concentration of 1.0 mM. The morphology of the corroded and inhibited copper surfaces was studied by scanning electron microscopy (SEM). The adsorption of the inhibitor molecules was confirmed by high-resolution X-ray photoelectron spectroscopy (XPS) profiles. XPS data were used to compare the inhibition efficiencies exhibited by studied compounds. The oxidation rate of the Cu surface was found to be frivolous, referring to high inhibition efficiency, only in the presence of inhibitor (5), and Cu⁰ share is 87% of all copper components. The shares of Cu⁰ were significantly reduced to 43%, 26% and 20% for inhibitors (3), (4) and (6), respectively. These findings go parallel with the results obtained from electrochemical measurements. The quantum-chemical calculations of the investigated molecules were performed to support electrochemical findings, and their correlations with the inhibition efficiency of the synthesized compounds were discussed.

用于合成3-优雅处理（7 ħ -二苯并[ C，H ]呫吨-7-基）苯甲醛（3） ，作为新原料，以创建一组新的氧杂蒽类似物，2-（3-（7 ħ -二苯并[ c，h ]黄嘌呤-7-基）亚苄基）丙二腈（4），3-（3-（7 H-二苯并[ c，h ]黄嘌呤-7-基）苯基] -2-氰基丙烯酸（5）和乙基-3-（3-（7 H-二苯并[ c，h ]黄嘌呤-7-基）苯基）-2-氰基丙烯酸酯（6），是从温和条件下的可用材料开始实现的。各种浓度的合成氰基-苯亚甲基氧杂蒽衍生物的（约0.1-1.0毫米），即化合物3 - 6，测试了作为抑制剂控制铜腐蚀在采用极化和电化学阻抗谱（EIS）测量的碱性溶液。结果表明，研究的四种黄嘌呤衍生物是有效的（混合型）抑制剂。随着抑制剂浓度的增加，其抑制效率也随之增加。所研究化合物的抑制性能根据其化学结构而变化。最好的抑制剂，化合物（5）在1.0 mM的浓度下，Pb的最大抑制效率达到98.7％（根据腐蚀电流密度计算）和〜95％（根据电荷转移电阻值估算）。通过扫描电子显微镜（SEM）研究了腐蚀和受抑制的铜表面的形貌。抑制剂分子的吸附通过高分辨率X射线光电子能谱（XPS）谱图确认。XPS数据用于比较所研究化合物的抑制效率。仅在存在抑制剂（5）的情况下，发现Cu表面的氧化速率是无意义的，这是指高的抑制效率，并且Cu ^0的份额为所有铜组分的87％。铜的份额⁰抑制剂（3），（4）和（6）的浓度分别显着降低至43％，26％和20％。这些发现与从电化学测量获得的结果一致。进行所研究分子的量子化学计算以支持电化学结果，并讨论了它们与合成化合物的抑制效率的关系。