<18O>-formaldehyde | 3228-24-8

• 分子结构分类: 有机化合物 - 有机氮化合物
• 英文名称: <18O>-formaldehyde
• 英文别名: ¹⁸O-formaldehyde；formaldehyde；Carbon monoxide (18O)；methan(18O)one
• CAS: 3228-24-8
• 化学式: CH₂O
• 分子量: 32.0269
• InChiKey: WSFSSNUMVMOOMR-HQMMCQRPSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.2
• 重原子数：
  2
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为产物：
  描述：

  甲基膦酸二甲酯 在 Ru surface-grown ¹⁸O-labeled ceria thin films 作用下， 生成 <18O>-formaldehyde
  参考文献：
  名称：

  Dimethyl methylphosphonate decomposition on fully oxidized and partially reduced ceria thin films

  摘要：

  The thermal decomposition of dimethyl methylphosphonate (DMMP) on crystalline ceria thin films grown on Ru(0001) was studied by temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and infrared absorption reflection spectroscopy (IRAS). TPD experiments show that methanol and formaldehyde desorb as the two main products at 575 K, while water, formaldehyde and CO are produced above 800 K. IRAS studies demonstrate that DMMP adsorbs via the phosphoryl oxygen at 200 K, but the P=O bond converts to a bridging O-P-O species at 300 K. DMMP decomposition initially occurs via P-OCH(3) bond scission to form methyl methylphosphonate (MMP) and methyl phosphonate (MP) between 300 and 500 K; XPS and IRAS data are consistent with a methoxy intermediate on the surface at these temperatures. The more stable P-CH(3) bonds remain intact up to 700 K, and the only surface intermediate at higher temperatures is believed to be PO(x). Although the presence of PO(x) decreases activity for DMMP decomposition, some activity on the ceria surface remains even after 7 cycles of adsorption and reaction. The ceria films become reduced by multiple DMMP adsorption-reaction cycles, with the Ce(+4) content dropping to 30% after seven cycles. Investigations of DMMP reaction on reduced ceria surfaces show that CO and H(2) are produced in addition to methanol and formaldehyde. Furthermore, DMMP decomposition activity on the reduced ceria films is almost completely inhibited after only 3 adsorption-reaction cycles. Similarities between DMMP and methanol chemistry on the ceria films suggest that methoxy is a key surface intermediate in both reactions. (C) 2009 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.susc.2009.12.028

文献信息

• Photolysis of allene-ozone mixtures at 647 nm in cryogenic matrices
  作者：Karen A. Singmaster、George C. Pimentel

  DOI：10.1016/0022-2860(89)80083-3

  日期：1989.3

  between allene and ozone were carried out at 12 K. Primary photoproducts include carbon monoxide, acrolein ( cis and trans ), cyclopropanone, ketene, ethylene, allene oxide and formaldehyde. In Ar and Kr matrices both acrolein and cyclopropanone are produced in high yields, whereas in Xe matrices cyclopropanone is the major product. Infrared spectra for cyclopropanone and its oxygen-18 and deuterium

  摘要 对丙二烯和臭氧在647 nm 处的光解反应在12 K 下进行基质研究。初级光产物包括一氧化碳、丙烯醛（顺式和反式）、环丙酮、乙烯酮、乙烯、丙二烯氧化物和甲醛。在 Ar 和 Kr 基质中，丙烯醛和环丙酮的产量都很高，而在 Xe 基质中，环丙酮是主要产物。报告了环丙酮及其氧 18 和氘替代物的红外光谱。环丙酮的羰基拉伸在 Ar 基质中的 1815 cm -1 处观察到。还报道了丙二烯氧化物的首次合成。在 1823.4 cm -1 处观察到碳-碳双键拉伸，并表现出小的氧 18 位移。从重原子自旋-单线态-三线态激发的轨道增强，讨论产物分布的变化，
• Formation of complex organic molecules in methanol and methanol–carbon monoxide ices exposed to ionizing radiation – a combined FTIR and reflectron time-of-flight mass spectrometry study
  作者：Surajit Maity、Ralf I. Kaiser、Brant M. Jones

  DOI：10.1039/c4cp04149f

  日期：——

  photoionization at 10.49 eV. Infrared spectroscopic analysis of the processed ice systems resulted in the identification of simple molecules including the hydroxymethyl radical (CH2OH), formyl radical (HCO), methane (CH4), formaldehyde (H2CO), carbon dioxide (CO2), ethylene glycol (HOCH2CH2OH), glycolaldehyde (HOCH2CHO), methyl formate (HCOOCH3), and ketene (H2CCO). In addition, ReTOF mass spectrometry of

  这项研究报道了在5.5 K下以高能电子形式暴露于电离辐射中的甲醇和甲醇-一氧化碳冰的辐射诱导化学过程，以及随后的程序升温脱附。通过固态的红外光谱在线和原位监测复杂有机分子的内源性形成，并使用高灵敏度的反射电子飞行时间（ReTOF）质谱和10.49的单光电离，通过程序升温解吸（TPD）进行辐照后进行监测。 eV。对制冰系统的红外光谱分析导致鉴定出简单分子，包括羟甲基（CH 2 OH），甲酰基（HCO），甲烷（CH 4），甲醛（H 2 CO），二氧化碳（CO 2），乙二醇（HOCH 2 CH 2 OH），乙醇醛（HOCH 2 CHO），甲酸甲酯（HCOOCH 3）和乙烯酮（H 2 CCO）。此外，在程序编程的解吸后，升华分子的ReTOF质谱法明确确定了几种封闭壳含C / H / O的有机物，包括乙烯酮（H 2 CCO），乙醛（CH 3 COH），乙醇（C 2 H 5 OH），二甲基醚（CH 3
• Catalytic oxidation of methane to methanol over Cu-CHA with molecular oxygen
  作者：Airi Hirayama、Yuka Tsuchimura、Hiroshi Yoshida、Masato Machida、Shun Nishimura、Kazuo Kato、Keisuke Takahashi、Junya Ohyama

  DOI：10.1039/d1cy00676b

  日期：——

  Direct oxidation of CH4 to CH3OH using O2 is challenging because of the high stability of CH4 and the relatively high reactivity of CH3OH. Here, Cu-CHA zeolites are tested for the direct oxidation of CH4. Catalytic production of CH3OH in a CH4–O2–H2O flow reaction is improved using CHA type zeolites compared to other zeolites including MOR, BEA, MFI, and FAU zeolites reported previously. In situ X-ray

  CH直接氧化4至CH 3 OH使用了O 2，是因为CH的高稳定性的挑战4和CH的相对高的反应性3 OH。在这里，测试了 Cu-CHA 沸石对 CH 4的直接氧化。与之前报道的其他沸石（包括 MOR、BEA、MFI 和 FAU 沸石）相比，使用 CHA 型沸石提高了 CH 4 -O 2 -H 2 O 流动反应中 CH 3 OH 的催化生产。就地X 射线吸收精细结构 (XAFS) 光谱表明，Cu-CHA 的高催化活性源于其氧化还原特性，特别是参与 CH 4活化的 Cu 2+的高还原性。改变反应气体浓度以找到 Cu-CHA 上的优化反应条件。此外，不仅基于气体浓度的影响，还基于使用 CD 4、18 O 2和 D 2 O的同位素气体效应研究了直接 CH 4氧化在 Cu-CHA 上的反应机理。决定速率的步骤是 CH 4的 C–H 活化，以及 CH 3的选择性OH 由 CH 3 OH的氧化速率决定，它受Cu-CHA
• Photooxidation of CH3Cl on TiO2(110) Single Crystal and Powdered TiO2 Surfaces
  作者：Jason C. S. Wong、Amy Linsebigler、Guangquan Lu、Jingfu Fan、John T. Jr. Yates

  DOI：10.1021/j100001a051

  日期：1995.1

  The photooxidation of CH3Cl on TiO2 has been investigated using two approaches. In the first, TiO2(110) (rutile) containing oxygen anion vacancy defect sites has been studied using temperature-programmed desorption to follow the production of photooxidation products. In the second approach, powdered TiO2 (mainly anatase) has been studied using transmission infrared spectroscopy.; On TiO2(110) the observed products are H2CO, CO, H2O, and HCl. On powdered TiO2, the products are CO, CO2, H2O (as surface OH groups), HCl, and CH2Cl2. The dissimilarities are postulated to be due to two factors: (1) different surface site distributions for the two types of TiO2 surface; (2) higher pressure of reactants in the powdered TiO2 investigation. Both sets of experiments were done in the absence of water and demonstrate that water is unnecessary for the photooxidation reaction. However, O-2 is crucial for the photooxidation of CH3Cl. The formation of CH2Cl2 as one of the photooxidation products over powdered TiO2 suggests that a free-radical-mediated mechanism exists in this case.
• Formation of novel 1,2-oxathietanes from 2-chloroethyl sulfoxide precursors and their reactions in solution, including formal [.sigma.2s + .sigma.2a] cycloreversions and rearrangements
  作者：J. William. Lown、R. Rao. Koganty

  DOI：10.1021/ja00273a042

  日期：1986.6