GIS OF PRECIOUS METAL DEPOSITS OF THE MAGADAN REGION: DEVELOPMENT AND CREATION

A photocatalytic system for the dearomative hydroarylation of benzene derivatives has been developed. Using a combination of an organic photoredox catalyst and an amine reductant, this process operates through a reductive radical-polar crossover mechanism where aryl halide reduction triggers a regioselective cyclization event, giving rise to a range of complex spirocyclic cyclohexadienes. This light-driven protocol functions at room temperature in a green solvent system (aq. MeCN), without the need for precious metal-based catalysts or reagents, or the generation of stoichiometric metal byproducts.

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New cryptogamic records. 3

Novosti sistematiki nizshikh rastenii ◽

10.31111/nsnr/2019.53.1.181 ◽

2019 ◽

Vol 53 (1) ◽

pp. 181-197 ◽

Cited By ~ 9

Author(s):

O. M. Afonina ◽

V. A. Boldyrev ◽

G. Ya. Doroshina ◽

V. E. Fedosov ◽

G. N. Ganasevich ◽

...

Keyword(s):

Saratov Region ◽

Magadan Region ◽

Franz Josef Land ◽

Khanty Mansi Autonomous

First records of lichens for the Saratov Region, of mosses for the Franz Josef Land Archipelago, the republics of Karelia and Khakassia, Stavropol, Khabarovsk and Kamchatka Territories, Khanty-Mansi Autonomous Area – Yugra, Magadan Region and first records of liverworts for the Tula Region are presented. Data on localities, habitats, distribution of recorded species are provided.

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The first lichenological survey in Koryakia (Northern Kamchatka, Russia) — the last unexplored part of Beringia

Novosti sistematiki nizshikh rastenii ◽

10.31111/nsnr/2019.53.1.107 ◽

2019 ◽

Vol 53 (1) ◽

pp. 107-142 ◽

Cited By ~ 2

Author(s):

D. E. Himelbrant ◽

I. S. Stepanchikova ◽

T. Ahti ◽

V. Yu. Neshataeva

Keyword(s):

East Asia ◽

Russian Far East ◽

Far East ◽

Kamchatka Peninsula ◽

Lichen Diversity ◽

Magadan Region ◽

Specific Species ◽

First Time ◽

Lichen Flora

The first lichenological inventory in Koryakia has resulted in the list of 315 species reported from Parapolsky Dale, within and in vicinities of the Koryak State Reserve. Altogether 46 species are published from the Kamchatka Territory for the first time, including Lecanographa grumulosa new to Russia, East Asia and Beringia; Cercidospora trypetheliza, Lecania dubitans, Pertusaria borealis, Piccolia ochrophora, Protoparmelia cupreobadia, Rimularia badioatra and Strangospora moriformis new to Russian Far East; Abrothallus bertianus, Cladonia strepsilis, Physciella melanchra, Rimularia badioatra, Sclerococcum parasiticum, Sphinctrina leucopoda and Strangospora moriformis new to Beringia. The lichen diversity of the study area is relatively poor due to natural reasons. Comparison with neighboring regions (Kamchatka Peninsula, Chukotka, Magadan Region, Yakutia and Alaska) shows that the lichen flora of Parapolsky Dale contains almost no specific species. The majority of the species recorded here are also known from neighboring regions, especially Alaska and Kamchatka Peninsula.

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The Chingandzha flora of the Okhotsk-Chukotka volcanic belt

Palaeobotany ◽

10.31111/palaeobotany/2019.10.13 ◽

2019 ◽

Vol 10 ◽

pp. 13-179

Author(s):

L. B. Golovneva

Keyword(s):

River Basin ◽

Volcanic Belt ◽

Flowering Plants ◽

Sedimentary Deposits ◽

North East ◽

The North ◽

Magadan Region ◽

Chukotka Volcanic Belt ◽

Systematic Composition ◽

Coastal Lowlands

The Chingandzha flora comes from the volcanic-sedimentary deposits of the Chingandzha Formation (the Okhotsk-Chukotka volcanic belt, North-East of Russia). The main localities of the Chingandzha flora are situated in the Omsukchan district of the Magadan Region: on the Tap River (basin of the middle course of the Viliga River), on the Kananyga River, near the mouth of the Rond Creek, and in the middle reaches of the Chingandzha River (basin of the Tumany River). The Chingandzha flora includes 23 genera and 33 species. Two new species (Taxodium viligense Golovn. and Cupressinocladus shelikhovii Golovn.) are described, and two new combinations (Arctopteris ochotica (Samyl.) Golovn. and Dalembia kryshtofovichii (Samyl.) Golovn.) are created. The Chingandzha flora consists of liverworts, horsetails, ferns, seed ferns, ginkgoaleans, conifers, and angiosperms. The main genera are Arctop teris, Osmunda, Coniopteris, Cladophlebis, Ginkgo, Sagenoptepis, Sequoia, Taxodium, Metasequoia, Cupressinocladus, Protophyllocladus, Pseudoprotophyllum, Trochodendroides, Dalembia, Menispermites, Araliaephyllum, Quereuxia. The Chingandzha flora is distinct from other floras of the Okhotsk-Chukotka volcanic belt (OCVB) in predominance of flowering plants and in absence of the Early Cretaceous relicts such as Podozamites, Phoenicopsis and cycadophytes. According to its systematic composition and palaeoecological features, the Chingandzha flora is similar to the Coniacian Kaivayam and Tylpegyrgynay floras of the North-East of Russia, which were distributed at coastal lowlands east of the mountain ridges of the OCVB. Therefore, the age of the Chingandzha flora is determined as the Coniacian. This flora is assigned to the Kaivayam phase of the flora evolution and to the Anadyr Province of the Siberian-Canadian floristic realm. The Chingandzha flora is correlated with the Coniacian Aleeky flora from the Viliga-Tumany interfluve area and with other Coniacian floras of the OCVB: the Chaun flora of the Central Chukotka, the Kholchan flora of the Magadan Region and the Ul’ya flora of the Ul’ya Depression.

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