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The 9‐borataphenanthrene anion is easily accessed by deprotonation of a 9,10‐dihydro‐9‐boraphenanthrene and its diverse reactivity is investigated. Alkylation occurs at the carbon adjacent to boron and room temperature hydroboration occurs across the B=C bond. The π ‐manifold of the central BC 5 ring coordinates to chromium in an η 6 fashion while only the B=C bond binds η 2 to gold, indicating versatility of the 9‐borataphenanthrene anion as a ligand. Supporting calculations rationalize the reactivity and aromaticity is corroborated by nucleus‐independent chemical shift (NICS) indices.
A cobalt norbornane σ‐alkane complex was synthesized by a single‐crystal to single‐crystal solid/gas hydrogenation from a norbornadiene precursor, as described by S. A. Macgregor, A. S. Weller et al. in their Communication on page 6177. The cover picture shows the title cobalt σ‐alkane complex within its anion cage, with the van der Waals surface highlighted. The non‐covalent interactions provided by the anion cage are essential for the stabilization of this remarkable complex.
Mixed signals: Modular LuxR‐type transcriptional activator proteins can be engineered to alter the signals to which they respond. This enables the rewiring of quorum‐sensing systems, and the resultant chimeric LuxRs can be applied for the activation of silent biosynthetic gene clusters. In this way, the novel natural product pseudomonol was identified from a bacterium of the genus Pseudomonas. Abstract. LuxR‐type transcriptional activator proteins frequently regulate the expression of biosynthetic gene clusters (BGCs). With only a fraction of bacterial BGCs being expressed under standard culturing conditions, modulation of LuxRs would provide a powerful approach to activate silent clusters. We show that by exploiting the modular nature of Lu.
Allosteric inhibition of kinase signaling is a promising approach for the targeted discovery of therapeutics with exceptional selectivity and the ability of overcoming the acquired resistance of the orthosteric ATP‐binding site inhibitors. The recent developments of allosteric kinase inhibitors that bind outside the catalytic kinase domain further warrant considerable interest and offer unique opportunities in this area. Abstract. Drugs that function through allosteric inhibition of kinase signaling represent a promising approach for the targeted discovery of therapeutics. The majority of developed allosteric kinase inhibitors are characterized as type III and IV inhibitors that show good kinome selectivity but generally lack the subtype sel.
Two for Two: A highly enantioselective annulation of two C−H bonds with alkynes without built‐in chelating groups was achieved through Ni−Al bimetallic catalysis enabled by a bulky BINOL‐derived secondary phosphine oxide (SPO) ligand. This reaction uses readily available formamides as starting materials and provides concise access to a broad range of chiral ferrocenes in 40–98 % yield and 93–99 % ee. Abstract. Twofold C−H annulation of readily available formamides and alkynes without built‐in chelating groups was achieved. Ni−Al bimetallic catalysis enabled by a bulky BINOL‐derived chiral secondary phosphine oxide (SPO) ligand proved to be critical for high reactivity and high selectivity. This reaction uses readily available formamides as s.
A cobalt σ‐alkane complex was synthesized by a single‐crystal to single‐crystal solid/gas hydrogenation from a norbornadiene precursor, and its structure was determined by X‐ray crystallography. Periodic DFT and electronic structure analyses revealed weak C−H→Co σ‐interactions, augmented by dispersive stabilization between the alkane ligand and the anion microenvironment. Abstract. A cobalt σ‐alkane complex, [Co(Cy2P(CH2)4PCy2)(norbornane)][BArF4], was synthesized by a single‐crystal to single‐crystal solid/gas hydrogenation from a norbornadiene precursor, and its structure was determined by X‐ray crystallography. Magnetic data show this complex to be a triplet. Periodic DFT and electronic structure analyses revealed weak C−H→Co σ‐interactio.
Increased attention SPAN: Recent advances in electrolyte regulation towards stable lithium‐metal anodes for Li‐sulfurized polyacrylonitrile (SPAN) batteries are summarized to afford design strategies of solvents, lithium salts, additives, and gel electrolyte. Abstract. Lithium–sulfur (Li–S) batteries are highly regarded as the next‐generation energy‐storage devices because of their ultrahigh theoretical energy density of 2600 Wh kg−1.
Excelsior (Mexico) 04/02/2020 20:13
Redacción. CIUDAD DE MÉXICO. Susana Distancia es un personaje que ha ganado bastante popularidad en los últimos días. Fue la Secretaría de Salud federal quien la presentó al público a mediados de marzo para hacer conciencia sobre la distancia (de aproximadamente metro y medio) que se debe de tener entre personas para evitar contagios de coronavirus Covid-19. Tras hacerse viral, la heroína ahora tiene su propia piñata. Foto Facebook: Piñatería Ramírez. Como ya es tradición, el negocio de la familia Ramírez, ubicado en Tamaulipas , sacó una edición del personaje del momento. Primero fue una piñata del coronavirus (con todo y la cara de un chino) y ahora crearon la de Susana Distancia, la cual tiene dos cepas del virus. Es una buena opción para
Kukmin Ilbo (Korea) 04/02/2020 20:12
미국 보건당국이 마스크를 포함한 안면 가리개(face covering) 착용을 권고하는 지침을 마련해 조만간 발표한다. 그동안 CDC는 건강한 사람은 마스크나 안면 가리개가 필요 없다고 강조해왔다는 점에서 중대한 변화다. 신종 코로나바이러스 감염증(코로나19) 대응 태스크포스(TF)의 총괄 책임자인 마이크 펜스 부통령은 2일(현지시간) 백악관에서 열린 일일 정례 브리핑에서 "안면 가리개와 마스크에 대한 업데이트된 질병통제예방센터(CDC)의 지침이 앞으로 며칠 내에 나오게 될 것"이라고 밝혔다고 로이터통신이 보도했다. 워싱턴포스트(WP)는 백악관이 코로나19의 확산을 방지하기 위해 미국 국민을 상대로 공공장소에서 천 마스크나 얼굴 가리개를 착용하기 시작할 것을 촉구할 것으로 예상된다면서 CDC가 조만간 새로운 가이드라인을 내놓을 것이라고 연방정부 당국자를 인용해 보도했다.
News-Medical.net 04/02/2020 20:11
A new study published in The BMJ in April 2020 suggests that almost any remedial diet can result in a certain amount of weight loss and a better cardiovascular risk profile over the next six months, compared with the usual diet. However, at the 12-month mark, the dieter has mostly gained back the weight, while most cardiovascular risk factors are back at their original levels.
Business Korea (Korea) 04/02/2020 20:11
[비지니스코리아=정민희 기자] 위메프가 월과 일이 같은 날인 4월 4일 숫자 4를 활용한 특가데이 ‘44데이’를 진행한다.위메프는 4~7일 44데이에서 ‘내가 4고 싶던 거 다 4는 날!’을 콘셉트로 초특가 상품을 판매한다고 3일 밝혔다.4일 0시부터 4시간마다 타임딜 상품을 공개한다. 주요 상품은 △3중필터 일회용 마스크 개별포장(화이트) 444원 △남녀 페이크삭스 1+1 444원 △푸드렐라 치킨 가라아게 외 4종 4444원 △해피바스 퍼퓸 바디워시 500g x 4 9444원 △엘르 14K 주얼리 봄 신상전(ELGPEE221 외)
Road to VR 04/02/2020 20:11
London-based hardware startup TG0 has launched a Kickstarter campaign for the Etee dev kit, a VR controller with integrated SteamVR Tracking. TG0 positions the controller’s button-less design and finger tracking as its main attractions. TG0 has launched the Etee Kickstarter campaign with the hopes of raising £45,900 (~$56,000) for its VR controller dev kit. The […]. .

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