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For example, ROR structures are known as acid anhydride rather than the more generic ester, other organic carbonyls are urea and the carbamates, the derivatives of acyl chlorides chloroformates and phosgene, carbonate esters, thioesters, lactones, lactams, hydroxamates, and isocyanates. Examples of inorganic compounds are carbon dioxide and carbonyl sulfide. A special group of compounds are 1, 3-dicarbonyl compounds that have acidic protons in the central methylene unit. Examples are Meldrums acid, diethyl malonate and acetylacetone, because oxygen is more electronegative than carbon, carbonyl compounds often have resonance structures which affect their reactivity. This relative electronegativity draws electron density away from carbon, increasing viagra dosages available bonds polarity, carbon can then be attacked by viagra headache cures or a negatively charged part of another molecule. During the reaction, the double bond is broken. This reaction is known as addition-elimination or condensation, the electronegative oxygen also can react with an electrophile, for example a proton in an acidic solution or with Lewis acids to form an oxocarbenium ion. The polarity of oxygen also makes the alpha hydrogens of carbonyl compounds much more acidic than typical sp3 C-H bonds, for example, the pKa values of acetaldehyde and acetone are 16.

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Under the Tang dynasty, the Zhuang moved to support Piluoges Yi-ruled kingdom of Nanzhao in Yunnan, Guangxi was then divided into an area of Zhuang ascendancy west of Nanning and an area of Han ascendancy east of Nanning. After the collapse of the Southern Zhao, Liu Yan established the Southern Han in Xingwangfu, although this state gained minimal control over Guangxi, it was plagued by instability and annexed by the Song dynasty in 971. The name Guangxi itself can be traced to the Song, who administered the area as the Guangnanxi Circuit, harassed by both Song and the Jiaozhi in modern Vietnam, the Zhuang leader Nong Zhigao led a revolt in 1052 for which he is still remembered by the Zhuang people. His independent kingdom was short-lived, however, and the tattooed Song general Di Qing returned Guangxi to China, the Yuan dynasty established control over Yunnan during its conquest of the Dali Kingdom in 1253 and eliminated the Southern Song following the Battle of Yamen in 1279.

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